Sound production unit and head-mounted sound production equipment

Abstract

The invention discloses a sound production unit and head-mounted sound production equipment, and relates to the technical field of sound production devices, and the sound production unit comprises a housing assembly, a bone conduction sound production device and an air conduction sound production device. The shell assembly comprises a shell with an opening in one end and a surface cover connected with the opening end of the shell; the bone conduction sounding device is arranged in the shell assembly and is connected with the surface cover; the air conduction sound production device is arranged in the shell assembly and is connected with the shell, and the bottom surface or the top surface of the air conduction sound production device faces the bone conduction sound production device; and the maximum magnetic flux leakage at the peripheral surface of the bone conduction sound production device is smaller than the magnetic flux leakage at the end surface of the vibration direction A of the bone conduction sound production device. The interference of the leakage flux of the bone conduction sounding device on the air conduction sounding device and electronic components in the sounding unit is reduced, and the working reliability of the sounding unit is improved.

Description

[0001] Priority information: This application claims priority to Chinese patent application No. 202411044063.7, filed on July 31, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This invention relates to the field of sound-generating devices, and more particularly to a sound-generating unit and a head-mounted sound-generating device. Background Technology

[0003] Head-mounted sound devices, such as headphones and smart glasses, all include a sound-generating device. Based on the different ways of sound transmission, the sound-generating device can be divided into bone conduction sound devices and air conduction sound devices.

[0004] Bone conduction devices typically include a coil and a magnetic circuit assembly, which vibrates as the energized coil drives the magnetic circuit assembly. Bone conduction devices are usually connected to a housing (such as the housing of an earphone head), through which the vibrations are transmitted to the skin of the face, allowing the person to hear sound.

[0005] Air-conducting sound-generating devices typically include a diaphragm, a coil connected to the diaphragm, and a magnetic circuit assembly that provides a magnetic field. When the coil is energized, it drives the diaphragm to vibrate under the interaction of the magnetic force with the magnetic circuit assembly, thereby agitating the air to produce sound.

[0006] With the development of technology, head-mounted audio devices have become increasingly mature and sophisticated, but there are still some areas for improvement to meet users' higher demands for head-mounted audio devices.

[0007] For example, traditional headphones typically only have bone conduction or air conduction sound generation devices, limiting sound production to either method. The applicant's research found that combining both bone conduction and air conduction devices within a single sound unit improves sound quality and expands sound generation options. However, when both devices are present, the leaked magnetic fields from each may adversely affect the operation of the other device and external electronic components.

[0008] In addition, there is still room for improvement in many aspects of head-mounted audio devices, including sound quality (or listening effect), wearing comfort, reliability, and privacy (sound leakage prevention).

[0009] The above content is only used to help understand the technical solution of this application and does not constitute an admission that the above is prior art. Summary of the Invention

[0010] The purpose of this invention is to provide a sound generating unit and a head-mounted sound generating device, which helps to improve the reliability of the sound generating unit.

[0011] To achieve the above-mentioned objectives, in one aspect, the present invention provides a sound-generating unit, comprising:

[0012] The housing assembly includes a housing with an opening at one end and a faceplate connected to the opening end of the housing, the housing assembly being provided with a sound outlet.

[0013] A bone conduction sound-emitting device, disposed within the housing assembly and connected to the faceplate; and,

[0014] An air-conducting sound-generating device is disposed within the outer shell assembly and connected to the shell. The bottom or top surface of the air-conducting sound-generating device faces the bone-conducting sound-generating device, and the air-conducting sound-generating device emits sound outward through the sound outlet.

[0015] The maximum magnetic leakage at the outer peripheral surface of the bone conduction sound generating device is less than the magnetic leakage at the end face of the bone conduction sound generating device in the vibration direction A.

[0016] The maximum magnetic leakage at the surface of the air-conducting sound-generating device facing the bone-conducting sound-generating device is less than the maximum magnetic leakage at the outer peripheral surface of the bone-conducting sound-generating device, and the surface of the air-conducting sound-generating device facing the bone-conducting sound-generating device is the bottom or top surface of the air-conducting sound-generating device.

[0017] On the other hand, the present invention proposes a head-mounted sound-generating device, including the sound-generating unit as described above.

[0018] Compared with the prior art, the present invention has the following beneficial effects: According to at least one embodiment of this application, the sound-generating unit simultaneously includes a bone conduction sound-generating device and an air conduction sound-generating device, enabling sound generation using both devices, which is beneficial for improving the listening effect. Furthermore, the maximum magnetic leakage at the outer peripheral surface of the bone conduction sound-generating device is less than the magnetic leakage at the end face of the bone conduction sound-generating device in the vibration direction A, which can reduce the interference of the bone conduction sound-generating device's magnetic leakage on the air conduction sound-generating device and the electronic components within the sound-generating unit, thereby improving the reliability of the sound-generating unit's operation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a head-mounted sound-generating device according to some embodiments of the present invention.

[0020] Figure 2 This is a schematic diagram showing the included angle between the side surface of the functional compartment and the contact surface of the sound-generating unit in some embodiments of the present invention.

[0021] Figure 3 This is a schematic diagram of the sound-generating unit in some embodiments of the present invention.

[0022] Figure 4This is a cross-sectional schematic diagram of the sound-generating unit in some embodiments of the present invention. In the figure, the housing is a single piece.

[0023] Figure 5 This is a cross-sectional schematic diagram of the sound-generating unit in some embodiments of the present invention. In the figure, the housing is a split type.

[0024] Figure 6 This is a schematic diagram of the structure of the sound-generating unit in some embodiments of the present invention.

[0025] Figure 7 yes Figure 6 The exploded view of the sound-generating unit shown.

[0026] Figure 8a yes Figure 6 The diagram shows a cross-sectional view of the sound-generating unit.

[0027] Figure 8b This is a schematic diagram of the structure of the sound-generating unit in some embodiments of the present invention.

[0028] Figure 8c This is a schematic diagram of the structure of the sound-generating unit in some embodiments of the present invention. In the figure, the structure of the bone magnetic circuit assembly is similar to... Figure 14a Consistent with the above.

[0029] Figure 9 This is a cross-sectional schematic diagram of the sound-generating unit in some embodiments of the present invention.

[0030] Figure 10a This is a schematic diagram of the structure of a bone conduction sound-generating device according to some embodiments of the present invention.

[0031] Figure 10b yes Figure 10a The diagram shows a cross-sectional view of the bone conduction sound-generating device.

[0032] Figure 11 This is a cross-sectional schematic diagram of a bone conduction sound-generating device according to some embodiments of the present invention. The structure of the bone conduction magnetic circuit assembly in the figure is similar to that of the present invention. Figure 14a Consistent with the above.

[0033] Figure 12 This is a schematic diagram of the structure of a bone conduction sound-generating device according to some embodiments of the present invention. In the figure, the bone conduction support is shaped like a racetrack.

[0034] Figure 13a This is a schematic diagram of the structure of the bone magnetic circuit assembly in some embodiments of the present invention.

[0035] Figure 13b yes Figure 13a The diagram shown is a schematic of the bone magnetic circuit assembly when it is a single, integrated component.

[0036] Figure 14aThis is a schematic diagram of the structure of the bone magnetic circuit assembly in some embodiments of the present invention.

[0037] Figure 14b yes Figure 14a The diagram shown is a schematic of the bone magnetic circuit assembly when it is a single, integrated component.

[0038] Figure 15a This is a schematic diagram of the structure of the bone magnetic circuit assembly in some embodiments of the present invention.

[0039] Figure 15b yes Figure 15a The diagram shown is a schematic of the bone magnetic circuit assembly when it is a single, integrated component.

[0040] Figure 16a This is a schematic diagram of the structure of the bone magnetic circuit assembly in some embodiments of the present invention.

[0041] Figure 16b yes Figure 16a The diagram shown is a schematic of the bone magnetic circuit assembly when it is a single, integrated component.

[0042] Figure 17 These are frequency response curves of bone conduction sound generation devices with different thicknesses in some embodiments of the present invention.

[0043] Figure 18 These are magnetic flux leakage curves of bone conduction sound generation devices with different thicknesses in some embodiments of the present invention.

[0044] Figure 19 yes Figure 10b A schematic diagram of the structure of a shrapnel.

[0045] Figure 20a These are cross-sectional views of spring clips in some embodiments of the present invention.

[0046] Figure 20b This is a cross-sectional view of the spring sheet from another perspective in some embodiments of the present invention.

[0047] Figure 21 This is a cross-sectional schematic diagram of a bone conduction sound-generating device according to some embodiments of the present invention. The structure of the bone conduction magnetic circuit assembly is shown in the diagram. Figure 14a Consistent with the above.

[0048] Figure 22 These are frequency response curves of bone conduction sound-generating devices in some embodiments of the present invention with magnets of different thicknesses.

[0049] Figure 23a This is a cross-sectional view of a bone conduction sound-generating device according to some embodiments of the present invention.

[0050] Figure 23bThis is a cross-sectional view of a bone conduction sound-generating device according to some embodiments of the present invention. The structure of the bone conduction magnetic circuit assembly in the figure is similar to that of the present invention. Figure 14a Consistent with the above.

[0051] Figure 24 This is a schematic diagram of the structure of the air-conducting sound-generating device in some embodiments of the present invention.

[0052] Figure 25 yes Figure 24 The top view of the air-conducting sound-generating device shown.

[0053] Figure 26 It is along Figure 25 A sectional view obtained by cutting along the MM section line.

[0054] Figure 27 This is a top view of the magnetic support component in some embodiments of the present invention.

[0055] Figure 28 This is a top view of the magnetic support component in some embodiments of the present invention.

[0056] Figure 29 This is a top view of the magnetic support component in some embodiments of the present invention.

[0057] Figure 30 This is a schematic diagram of the structure of the air-conducting sound-generating device in some embodiments of the present invention.

[0058] Figure 31 yes Figure 30 The diagram shows a cross-sectional view of the air-conducting sound-generating device.

[0059] Figure 32 yes Figure 31 Enlarged view of Part III.

[0060] Figure 33 yes Figure 30 The diagram shows the positions of the magnetic support, main magnet, and main pole core plate of the air-conducting sound-generating device.

[0061] Figure 34 It is along Figure 26 The sectional view obtained by cutting along the JJ section line.

[0062] Figure 35 This is a schematic diagram showing the positions of the magnetically conductive support, secondary magnet, and secondary pole core plate in some embodiments of the present invention.

[0063] Figure 36 This is a schematic diagram showing the positions of the magnetically conductive support, secondary magnet, and secondary pole core plate in some embodiments of the present invention.

[0064] Figure 37 This is a schematic diagram showing the positions of the magnetically conductive support, secondary magnet, and secondary pole core plate in some embodiments of the present invention.

[0065] Figure 38 yes Figure 26 The diagram shows the structure of the air-conducting magnetic circuit assembly of the air-conducting sound-generating device.

[0066] Figure 39 yes Figure 26 Enlarged view of section II.

[0067] Figure 40 yes Figure 30 An exploded diagram of the diaphragm assembly.

[0068] Figure 41 yes Figure 24 A schematic diagram of the diaphragm assembly in the image.

[0069] Figure 42 yes Figure 24 The diagram shown illustrates the air-conducting sound-generating device when double-sided adhesive is used.

[0070] Figure 43 This is a schematic diagram showing the connection of the control circuit board, bone conduction coil, and air conduction coil in some embodiments of the present invention.

[0071] Figure 44 This is a schematic diagram showing the connection of the control circuit board, bone conduction coil, and air conduction coil in some embodiments of the present invention.

[0072] Figure 45a This is a schematic diagram showing the location of the adapter circuit board in some embodiments of the present invention. In the diagram, the adapter circuit board is located on one side of the bone conduction sound generation device.

[0073] Figure 45b This is a schematic diagram showing the location of the adapter circuit board in some embodiments of the present invention. In the figure, the adapter circuit board is located on one side of the bone conduction sound generation device, and the structure of the bone conduction magnetic circuit assembly is similar to... Figure 14a Consistent with the above.

[0074] Figure 46a This is a schematic diagram showing the location of the adapter circuit board in some embodiments of the present invention. In the diagram, the adapter circuit board is located below the bone conduction sound generator.

[0075] Figure 46b This is a schematic diagram showing the location of the adapter circuit board in some embodiments of the present invention. In the figure, the adapter circuit board is located below the bone conduction sound generation device, and the structure of the bone conduction magnetic circuit assembly is similar to... Figure 14a Consistent with the above. Detailed Implementation

[0076] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, it should be noted that, for ease of description, only the parts relevant to this application are shown in the accompanying drawings, not the entire structure. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without inventive effort are within the scope of protection of this application.

[0077] The terms “comprising” and “having”, and any variations thereof, used in this application are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0078] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0079] The area of ​​a hole mentioned in this article refers to the size of the area enclosed by the outer contour of the hole.

[0080] Unless otherwise specified, the dimensions or ranges of “length,” “width,” “height,” “thickness,” “wall thickness,” etc. mentioned in this article refer to the dimensions or ranges of the largest part in the corresponding direction.

[0081] This specification describes a head-mounted sound-generating device that can be worn on the human head to enable a person to hear sound, for example, through bone conduction and / or air conduction. The head-mounted sound-generating device includes a sound-generating unit 10 and a wearing mechanism 11 connected to the sound-generating unit 10. The sound-generating unit 10 is used to emit sound, and the wearing mechanism 11 is used to wear the sound-generating unit 10 on the human head so that the sound can be easily heard. For example, the sound-generating unit 10 is worn in a position corresponding to the human ear, for example, directly inserted into the ear or located near the front of the ear.

[0082] In some embodiments, the wearing mechanism 11 may be a loop (e.g., U-shaped) with an opening, which is fitted over the user's head for wearing. In some embodiments, the wearing mechanism 11 may include ear hooks that are curved and can hang above the user's ears. In some embodiments, the wearing mechanism 11 may include structures such as curved back hooks and ear hooks adapted to hook above the human ear, with the back hooks adapted to wrap around the back of the human head. In some embodiments, the wearing mechanism 11 may also be a frame structure, the frame structure including temples located on both sides of the head, with the sound-generating unit 10 connected to the temples.

[0083] In some embodiments, the head-mounted sound device includes a single sound-emitting unit 10, which is worn on the left or right ear. For example, when the head-mounted sound device is a single-ear headphone, it includes only one sound-emitting unit 10 and may also have an ear hook that hooks onto the ear. In other embodiments, the head-mounted sound device includes two sound-emitting units 10, respectively worn on the left and right ears. For example, the head-mounted sound device may be a binaural headphone or glasses, in which case it includes two sound-emitting units. Depending on the product, the head-mounted sound device may also include a back hook and ear hooks or a frame structure.

[0084] The following example uses headphones, which are binaural headphones, as an illustration.

[0085] like Figure 1 As shown, Figure 1 The headset shown is a binaural headphone, comprising two sound-generating units 10 (or headphone heads), a back hook 110 adapted to wrap around the back of the head, two ear hooks 111 adapted to hook onto the ears, and two functional compartments for housing a control circuit board and / or a battery. For example, the two functional compartments are a control compartment 112 for housing the control circuit board and a battery compartment 113 for housing the battery; or each functional compartment houses both the control circuit board and / or the battery. The back hook 110 connects between the two functional compartments. The two sound-generating units 10 are respectively assigned to the two functional compartments, and the sound-generating units 10 and their corresponding functional compartments are connected via the ear hooks 111. Specifically, the back hook 110 connects between the control compartment 112 and the battery compartment 113. The control compartment 112 and one of the sound-generating units 10, as well as the battery compartment 113 and the other sound-generating unit 10, are each connected via an ear hook 111. Understandably, the rear hook 110, ear hook 111, and two functional compartments together constitute the headphone wearing mechanism 11.

[0086] It is understandable that although this manual uses binaural headphones as an example, head-mounted sound devices are not limited to binaural headphones. For example, they can also be hearing aids, audio glasses, smart helmets, VR devices, AR devices, and other electronic devices.

[0087] The overall design of the head-mounted sound device is symmetrical to improve wearing comfort. For example... Figure 1 and Figure 2 As shown, the functional compartment has a side surface 1123 facing the human body when the head-mounted sound device is worn, and the sound unit 10 has a contact surface 10010 that contacts the human skin when the head-mounted sound device is worn. The included angle β1 formed between the side surface 1123 and the contact surface 10010 facing the head is an obtuse angle, so that the contact surface 10010 is deflected relative to the side surface 1123 towards the head by a certain angle. Optionally, the included angle β1 is in the range of 160° to 170°.

[0088] Alternatively, the lower end 10010a of the contact surface 10010 is farther from the side surface 1123 than its upper end 10010b, that is, the sound-generating unit 10 is deflected upward as a whole, so that the contact surface 10010 fits more closely with the facial skin, which is beneficial to improve the sound transmission effect, and at the same time can better ensure the formation of a gap to accommodate the temples.

[0089] It should be noted that when defining the included angle between two surfaces in this article, the surfaces can be either planar or curved. When the surface is planar, the included angle with that surface is the same as the included angle with the plane containing that surface. When the surface is curved, refer to... Figure 3 The most convex or concave point of the arc surface has a tangent plane 10011. The angle between the arc surface and the tangent plane 10011 can be understood as the angle between the arc surface and the tangent plane 10011. For example, when both the contact surface 10010 and the side surface 1123 are planes, the angle β1 is the angle between the two planes. When both the contact surface 10010 and the side surface 1123 are arc surfaces, the angle β1 is the angle between the tangent plane of the contact surface 10010 and the tangent plane of the side surface 1123.

[0090] The following section provides an example of the sound-generating unit in a head-mounted audio device.

[0091] The sound-generating unit 10 includes a housing assembly 100 and a sound-generating device disposed inside the housing assembly 100. Optionally, the housing assembly 100 is formed by connecting at least two housings. In some embodiments, such as... Figure 4 As shown, the outer shell assembly 100 includes a shell 1000 with an open end and a face cover 1001 that seals the open end of the shell 1000. The shell 1000 is integrally molded. The face cover 1001 contacts the facial skin when worn. Optionally, a soft layer (not shown) is provided on the outer side of the face cover 1001 to improve comfort when in contact with the face. The material of the soft layer can be, for example, silicone. It is understood that the surface of the face cover 1001 that contacts the facial skin is the contact surface 10010. In other embodiments, such as... Figure 5As shown, the housing 1000 is formed by connecting two parts, including a side shell 1004 and a back cover 1002. The front cover 1001 and back cover 1002 are disposed opposite each other, each sealing one of the two open ends of the side shell 1004. Optionally, the side shell 1004 is tubular. The side shell 1004 is not limited to a single part; for example, it can be formed by connecting two or more parts into a tubular shape. It is understood that when the housing 1000 is integrally formed, the back cover 1002 and the side shell 1004 are integral. The housing 1000 is not limited to having only one opening; in other embodiments, the housing 1000 may also have two or more openings. For example, the side shell 1004 may have a notch, which is then sealed by a cover or other component.

[0092] The sound-generating unit 10 is connected to the ear hook 111 via its housing assembly 100. For example, the ear hook 111 may be connected to the side shell portion 1004.

[0093] The sound-generating device is used to convert electrical signals into mechanical vibrations. For example, it can be a bone conduction sound generator, which converts electrical signals into mechanical vibrations and transmits these vibrations directly to the skin through a face cover 1001 that fits in contact with the facial skin, allowing the person to hear the sound via bone conduction. The sound-generating device can also be an air conduction sound generator, in which case it uses mechanical vibrations to agitate air, thereby generating air-conducted sound. It is understood that the housing assembly 100 is not limited to installing only one or a single type of sound-generating device.

[0094] In some embodiments, such as Figure 4 and Figure 5 As shown, the sound-generating unit 10 can transmit sound through both bone conduction and air conduction. At this time, it is equipped with both a bone conduction sound-generating device 2 and an air conduction sound-generating device 3. Optionally, the bone conduction sound-generating device 2 is connected to the face cover 1001 and / or the back cover 1002.

[0095] It is understandable that when the sound-generating unit 10 has independently configured bone conduction sound-generating device 2 and air conduction sound-generating device 3, it can selectively utilize bone conduction sound-generating device 2 and air conduction sound-generating device 3 to generate sound, increasing the diversity of sound generation methods. Furthermore, it can fully utilize the combined performance advantages of bone conduction and air conduction by leveraging the individual sound generation characteristics of bone conduction sound-generating device 2 and air conduction sound-generating device 3, while avoiding their disadvantages. For example, it can filter out the frequency band with the strongest vibration in the bone conduction vibration section to reduce numbness, while utilizing the bass frequencies of the air conduction low-frequency section to enhance low-frequency sensitivity. Of course, the above examples are only one aspect; those skilled in the art can fully utilize combined methods to diversify and improve sound quality, overcoming the shortcomings of using a single sound-generating unit independently, thereby improving the listening effect. The following description uses a sound-generating unit with two sound-generating devices as an example. It is understood that the bone conduction sound-generating device 2 and air conduction sound-generating device 3 described below can also be applied individually to the sound-generating unit 10.

[0096] Figures 6 to 8a This is a schematic diagram of the structure of a sound-generating unit 10 according to some embodiments of this specification. The sound-generating unit 10 includes a housing assembly 100 and a bone conduction sound-generating device 2 and an air conduction sound-generating device 3, both disposed within the housing assembly 100. The bone conduction sound-generating device 2 is connected to a face cover 1001, and its vibration is transmitted to the human body through the face cover 1001. The air conduction sound-generating device 3 is disposed on one side of the bone conduction sound-generating device 2. In other embodiments, the bone conduction sound-generating device 2 may also be connected to a back cover 1002, transmitting vibration to the face cover 1001 through the housing 1000, and then transmitting vibration to the human body through the face cover 1001. In other embodiments, the bone conduction sound-generating device 2 may also be connected to both the face cover 1001 and the back cover 1002 simultaneously. The housing assembly 100 is provided with a sound outlet 1003 communicating with the inside and outside. The air conduction sound-generating device 3 emits sound outward through the sound outlet 1003 and has a diaphragm 321 for vibration sound generation. Optionally, the diaphragm 321 is disposed opposite to the sound outlet 1003. Because both bone conduction sound generation device 2 and air conduction sound generation device 3 are installed simultaneously, bone conduction sound transmission and air conduction sound transmission can be realized at the same time, increasing the volume. They can also utilize their respective advantageous frequency bands to achieve better auditory effects.

[0097] In some embodiments, the air-conducting sound-generating device 3 is located on one side of the width direction of the bone-conducting sound-generating device 2, and the air-conducting sound-generating device 3 and the bone-conducting sound-generating device 2 are arranged along the width direction Y of the sound-generating unit 10. This arrangement makes the air-conducting sound-generating device 3 and the bone-conducting sound-generating device 2 more reasonable, the structure more compact, saves space and optimizes weight distribution, and helps to control the mass and volume of the sound-generating unit 10 within a small range. The sound-generating unit 10 can have a suitable shape and volume, and will not be too long to cause discomfort when worn. It also facilitates the air-conducting sound-generating device 3 to emit sound close to the ear. At the same time, when worn, the bone-conducting sound-generating device 2 is located on the side away from the ear. When the angle β1 formed between the side surface 1123 and the contact surface 10010 towards the head is 160° to 170°, the part of the outer shell assembly 100 corresponding to the bone-conducting sound-generating device 2 is deflected towards the face, which can better fit the face, thereby promoting the sound transmission efficiency of the bone-conducting sound-generating device 2. The length (X), width (Y), and thickness (or height) (Z) directions of the sound-emitting unit 10 can be referenced. Figure 6 In the XYZ coordinate system, the thickness direction is perpendicular to the contact surface 10010. It can be understood that the length, width and thickness direction of the outer shell assembly 100 are consistent with the length, width and thickness direction of the sound-emitting unit 10.

[0098] The air-conducting sound-generating device 3 and the bone-conducting sound-generating device 2 are elongated, with their length greater than their width. For example, the outer contour of the cross-section of the air-conducting sound-generating device 3 and the bone-conducting sound-generating device 2 is rectangular (its corners can be rounded, right-angled, chamfered, or other transitional connection shapes between the long and short sides, such as curves) or racetrack-shaped, etc.

[0099] Optionally, the length-to-width ratio of the bone conduction sound generator 2 is 1.3 to 3, and the length-to-width ratio of the air conduction sound generator 3 is 1.3 to 3.

[0100] Unless otherwise specified, this instruction manual uses the cuboid-shaped bone conduction sound generator 2 and air conduction sound generator 3 as examples. It is understood that using the cuboid shape as an example does not mean that the bone conduction sound generator 2 and air conduction sound generator 3 must be cuboid-shaped; their cross-sectional outer contours can also be racetrack-shaped, cylindrical, elliptical, or polygonal, etc.

[0101] The vibration direction and sound outlet of the bone conduction sound generator 2 and the air conduction sound generator 3 will be illustrated with examples below.

[0102] like Figure 4 As shown, the positive direction of vibration direction A of the bone conduction sound-generating device 2 points towards the contact surface 10010 between the face cover 1001 and the human body. The positive direction of vibration is the direction pointing outward from the shell 1000, and the negative direction is the direction pointing inward from the shell 1000, which is opposite to the positive direction. Specifically, Figure 4 In the diagram, "+" and "-" indicate the positive and negative directions, respectively. The positive direction of vibration direction A is upward, and the negative direction is downward. The positive direction of vibration direction B is to the left, and the negative direction is to the right. Optionally, the angle α1 between vibration direction A and contact surface 10010 is 60° to 90°. More preferably, the angle α1 between vibration direction A and contact surface 10010 is 75° to 90°. Even more preferably, the angle α1 between vibration direction A and contact surface 10010 is 90°. As mentioned above, when the contact surface 10010 is a plane, the angle α1 between an object (e.g., vibration direction A) and the contact surface 10010 is the angle between the object and the plane containing the contact surface 10010. When the contact surface 10010 is an arc surface, the most convex or concave point of the arc surface has a tangent plane 10011. In this case, the angle α1 between an object and the contact surface 10010 can be understood as the angle between the vibration direction A and the tangent plane 10011. Setting the angle α1 to be greater than 60° can reduce the component of vibration parallel to the face, allowing the vibration of the bone conduction sound-generating device 2 to be better transmitted to the skull and reducing vibration loss.

[0103] The positive direction of the vibration direction B of the air-conducting sound-generating device 3 points towards the side shell portion 1004 of the housing 1000. The vibration direction B is not parallel to or coincides with the vibration direction A of the bone-conducting sound-generating device 2; in other words, there is a non-zero angle between the vibration direction B of the air-conducting sound-generating device 3 and the vibration direction A of the bone-conducting sound-generating device 2. In some embodiments, such as... Figure 8a and Figure 8c As shown, the air-conducting sound-generating device 3 is positioned away from the bone-conducting sound-generating device 2 (the side where the diaphragm 321 of the air-conducting sound-generating device 3 is located is its front side, and its bottom surface 3b is its back side). In this configuration, its diaphragm 321 is close to the sound outlet 1003, which helps to improve sound transmission efficiency and increase volume. In other embodiments, refer to... Figure 8b The air conduction sound generating device 3 is positioned facing the bone conduction sound generating device 2. For example, an opening can be provided on the bottom surface 3b or other parts of the air conduction sound generating device 3, such as opening a vent 3c connecting the inner and outer sides of the air conduction sound generating device 3, so that sound can be transmitted.

[0104] It is understandable that the air conduction sound generating device 3 is positioned facing or away from the bone conduction sound generating device 2, so that its thickness direction corresponds to the width direction of the sound generating unit 10. This reduces the space occupied in the width direction of the sound generating unit 10, which helps to prevent the sound generating unit 10 from being too wide and causing discomfort when worn.

[0105] refer to Figure 4 and Figure 6 When the head-mounted sound device is worn, the side shell portion 1004 of the housing 1000 has a proximal end 10040 close to the human ear in its width direction Y. Obviously, the proximal end 10040 of the side shell portion 1004 is also the proximal end 10040 of the housing 1000, the outer shell assembly 100 and the sound generating unit 10. The air-conducting sound-generating device 3 is positioned closer to the proximal end 10040 of the bone-conducting sound-generating device 2, and is configured to emit sound towards the proximal end 10040 of the side shell portion 1004. The sound outlet 1003 is located on the proximal end 10040. This allows the air-conducting sound-generating device 3 to be close to and towards the ear, improving sound directness and clarity, reducing sound loss and distortion, enabling the user to hear a louder air-conducted sound, resulting in higher sound generation efficiency and better effect. Furthermore, it allows for a reduction in the size of the air-conducting sound-generating device 3, facilitating miniaturization. Additionally, the bone-conducting sound-generating device 2 is farther from the sound outlet 1003, reducing interference caused by internal sound waves emanating from the sound outlet when the bone-conducting sound-generating device 2 vibrates. Figure 1 As shown, the proximal end 10040 is also the end of the side shell 1004 near the functional compartment, and the sound outlet 1003 is opened on the end face of the side shell 1004 of the outer shell assembly 100 facing the functional compartment.

[0106] In some embodiments, reference Figure 9The angle α2 between the vibration direction B of the air-conducting sound-generating device 3 and the contact surface 10010 is 0–45°. Setting the angle α2 between the vibration direction B and the contact surface 10010 to 0–45° allows the sound emitted by the air-conducting sound-generating device 3 to be more accurately directed to the ear canal, improving sound propagation efficiency and reducing sound leakage. Further optionally, the angle α2 is 0–30°, and even further, the angle α2 is 0–15°, so that the sound emitted by the air-conducting sound-generating device 3 can be more accurately directed to the ear canal. When the angle α2 is greater than 0°, the positive direction of the vibration direction B of the air-conducting sound-generating device 3 points towards the side where the contact surface 10010 is located, or towards the plane where the contact surface 10010 is located, and extends away from the bone conduction sound-generating device 2. Optionally, when wearing the head-mounted sound-generating device, the positive direction of the vibration direction B points towards the inside of the auricle, thereby utilizing the sound-focusing effect of the auricle to improve the hearing effect and help reduce sound leakage.

[0107] Understandably, the angles of the bone conduction sound generator 2 and the air conduction sound generator 3 can be adjusted in various ways. Figure 9 In the illustrated embodiment, each is connected to the face cover 1001 and the side shell 1004 respectively via a connector 12. The surface of the connector 12 connected to the sound-generating device is inclined; therefore, the bone conduction sound-generating device 2 and the air conduction sound-generating device 3 are also inclined after installation. In other embodiments, the connector 12 may be omitted, and inclined surfaces may be provided on the face cover 1001 and the side shell 1004. The bone conduction sound-generating device 2 and the air conduction sound-generating device 3 are respectively installed on the corresponding inclined surfaces to adjust the angle.

[0108] In the embodiments described in this specification, the thickness direction of the bone conduction sound generator 2 is consistent with its vibration direction A, and the thickness direction of the air conduction sound generator 3 is consistent with its vibration direction B.

[0109] The connection structure between the air-conducting sound-generating device 3 and the outer shell assembly 100, as well as the relevant features of the front cavity, will be illustrated with examples below.

[0110] In some embodiments, the sound-generating unit 10 further includes a front cavity 10042 and a rear cavity 10044, which are separated by the diaphragm 321 of the air-conducting sound-generating device 3. Specifically, the side of the diaphragm 321 facing outwards from the housing assembly 100 is the front cavity, and the side facing inwards from the housing assembly 100 is the rear cavity. The front cavity 10042 communicates with the sound outlet 1003 to emit sound outwards. By providing the front cavity 10042, it is advantageous to concentrate the sound generated by the vibration of the diaphragm 321 through the front cavity 10042 and the sound outlet 1003, thereby improving sound transmission efficiency, reducing volume loss, and allowing the use of a smaller air-conducting sound-generating device 3, which is beneficial for miniaturization of the sound-generating unit 10. Simultaneously, it is beneficial for improving high-frequency sensitivity. It is understood that the interior and exterior of the air-conducting sound-generating device 3 are connected to allow for smooth airflow and balance the internal and external air pressures of the air-conducting sound-generating device 3. Optionally, the air-conducting sound-generating device 3 has at least one vent 3c connecting its interior and exterior. The vent 3c can be provided, for example, on the magnetic base plate 3100 and / or magnetic side plate 3101 of the magnetic support member 310. Figure 8a The illustration shows a case where a vent 3c is provided on the magnetically conductive base plate 3100. In some cases, sound can be emitted outward through the vent 3c, for example, as shown in the reference... Figure 8b When the bottom surface 3b of the air-conducting sound-generating device 3 is set facing the sound outlet 1003, it can emit sound outward through the vent 3c.

[0111] In some embodiments, the bone conduction sound generator 2 and the air conduction sound generator 3 are located in the same cavity of the housing assembly 100. This allows the housing assembly 100 to have a larger rear cavity 10044, reducing the F0 of the air conduction sound generator 3 and improving low-frequency performance. Furthermore, it effectively utilizes the internal space of the housing assembly 100, allowing for a more rational arrangement of the two sound generators within the earphone head. Compared to separating the two bone conduction sound generators 2 and air conduction sound generator 3 with a partition, this results in a smaller and more compact earphone head. Simultaneously, the reduced earphone head size leads to a corresponding reduction in the housing volume, reducing the overall weight of the earphone head and alleviating the burden during wear. This weight reduction also helps improve the high-frequency response of the bone conduction sound transmission section, enhancing the high-frequency sound quality. In some embodiments, refer to... Figure 8aThe housing 1000 is provided with through holes 10000 connecting its inner and outer sides. For example, one or more (in this specification, multiple includes two or more) through holes 10000 can be provided on the back cover 1002 and / or the side shell 1004. The through holes 10000 communicate with the rear cavity 10044, which helps to increase the rear cavity 10044 of the air conduction sound generating device 3, thereby reducing F0 and improving low-frequency sensitivity. In other embodiments, the bone conduction sound generating device 2 and the air conduction sound generating device 3 can be respectively set in two independent cavities, for example, separated by a partition, to reduce mutual interference during operation. Optionally, the cavity where the air conduction sound generating device 3 is located is provided with a through hole 10000 communicating with the outside. The parameters of the through hole 10000 can be referred to above. Alternatively, the cavity where the bone conduction sound generating device 2 is located is provided with a through hole 10000, and the partition is provided with a channel connecting the two cavities.

[0112] The air-conducting sound-generating device 3 is fixedly connected to the housing assembly 100. In some embodiments, the air-conducting sound-generating device 3 is connected to the inner wall of the side shell portion 1004, for example, through its diaphragm 321, air-conducting support 30, magnetically conductive side plate 3101 and / or magnetically conductive base plate 3100 (see reference numerals). Figure 26 and Figure 31 The air-conducting sound-generating device 3 is connected to the inner wall. In other embodiments, to further reduce the space occupied by the air-conducting sound-generating device 3 within the housing assembly 100, the air-conducting sound-generating device 3 can be embedded in the side housing portion 1004. This reduces the space occupied by the air-conducting sound-generating device 3 within the housing assembly 100, thereby facilitating the miniaturization of the sound-generating unit 10. Additionally, it improves the robustness of the connection between the air-conducting sound-generating device 3 and the side housing portion 1004. The air-conducting sound-generating device 3 is at least partially embedded in the side housing portion 1004, for example, referring to... Figure 6 and Figure 7 The inner wall of the side shell 1004 is provided with a mounting groove 10041, and the air-conducting sound-generating device 3 is disposed in the mounting groove 10041. In the illustrated embodiment, the air-conducting sound-generating device 3 is partially located in the mounting groove 10041. In other embodiments, the air-conducting sound-generating device 3 may also be completely located in the mounting groove 10041. The mounting groove 10041 not only saves space occupied by the air-conducting sound-generating device 3, but also serves to position the air-conducting sound-generating device 3. Compared with the solution of attaching it to the inner wall of the side shell 1004, there is no need to set up a separate limiting structure. Furthermore, the mounting groove 10041 makes the contact area between the air-conducting sound-generating device 3 and the outer shell assembly 100 relatively larger, which can also increase the firmness of the installation of the air-conducting sound-generating device 3.

[0113] Optionally, the faceplate 1001 is connected to the end face 1000a of the housing 1000, and one side of the mounting groove 10041 extends to the end face 1000a and has an opening facing the end face 1000a. That is, the mounting groove 10041 is connected to the end face 1000a. In this way, the air-conducting sound generating device 3 can be directly installed downward from the end face 1000a, which is more convenient for installation and can make fuller use of the space in the thickness direction of the sound generating unit 10. This is beneficial to increase the volume of the air-conducting sound generating device 3 and the effective radiation area of ​​the diaphragm 321, or reduce the volume of the sound generating unit 10. Figure 7 In the illustrated embodiment, the mounting groove 10041 is not connected to the back cover 1002, and its other side is spaced apart from the back cover 1002. Further alternatively, in other embodiments, the mounting groove 10041 is connected to the back cover 1002, that is, the other side of the mounting groove 10041 extends to the inner surface of the back cover 1002, so as to further improve space utilization and increase the available size of the air-conducting sound generating device 3 in the thickness direction of the sound generating unit 10.

[0114] The air-conducting sound-generating device 3 can be adhesively connected to the inner wall of the mounting groove 10041 and / or the back cover 1002 and / or the front cover 1001. When the air-conducting sound-generating device 3 is connected to two or all of the mounting groove 10041, the back cover 1002, and the front cover 1001, the connection is further secured, ensuring the reliability of the air-conducting sound-generating device 3. Optionally, the air-conducting sound-generating device 3 can be adhesively connected to the bottom surface 10043 of the mounting groove 10041, for example, by using double-sided tape or adhesive application. For example, see reference... Figure 8a The outer edge of the diaphragm 321 of the air-conducting sound-generating device 3 (e.g., the outer ring plate 3210 mentioned below) is bonded to the bottom surface 10043 of the groove. In other embodiments, the air-conducting sound-generating device 3 also includes a pressure cap 33 connected to the diaphragm 321, in which case it can be bonded to the bottom surface 10043 of the groove through the pressure cap 33. In other embodiments, the air-conducting sound-generating device 3 can also be bonded to the bottom surface 10043 of the groove through its magnetically conductive base plate 3100. The air-conducting sound-generating device 3 can also be bonded to the side wall of the mounting groove 10041 and the face cover 1001 with adhesive, thereby improving the firmness of the connection. Optionally, when the air-conducting sound-generating device 3 is installed in the mounting groove 10041, it is flush with the end face 1000a of the housing 1000 facing the face cover 1001, so as to facilitate the installation and bonding of the face cover 1001. Optionally, the air-conducting sound-generating device 3 can also be bonded to the back cover 1002. In some embodiments, a cavity may be provided on the cover 1001, and the air-conducting sound-generating device 3 extends beyond the end face 1000a into the cavity to increase the volume of the air-conducting sound-generating device 3 and improve space utilization.

[0115] refer to Figure 7 and Figure 8aThe side shell portion 1004 of the housing 1000 is provided with the aforementioned front cavity 10042. The front cavity 10042 connects the mounting groove 10041 and the sound outlet 1003. The front cavity 10042 is correspondingly arranged with the sound outlet surface (i.e., diaphragm 321) of the air-conducting sound-generating device 3, and extends from the bottom surface 10043 of the mounting groove 10041 toward the sound outlet 1003. It is understood that the mounting groove 10041 is not necessary. For example, the mounting groove 10041 may not be provided, and the front cavity 10042 may be directly formed on the inner wall of the side shell portion 1004 and connected to the sound outlet 1003. The air-conducting sound-generating device 3 is also directly connected to the inner wall of the side shell portion 1004.

[0116] The bone conduction sound generation device 2 of the sound generation unit 10 will be illustrated with an example next.

[0117] First, it should be noted that the bone conduction sound generating device 2 and the air conduction sound generating device 3 include similar components, such as supports, magnetic circuit assemblies, and coils. For ease of distinction, the corresponding components of the bone conduction sound generating device 2 and the air conduction sound generating device 3 are referred to as bone conduction components or air conduction components, respectively. For example, the support, magnetic circuit assembly, and coil of the bone conduction sound generating device 2 are referred to as bone conduction support, bone conduction magnetic circuit assembly, and bone conduction coil, respectively; and the support, magnetic circuit assembly, and coil of the air conduction sound generating device 3 are referred to as air conduction support, air conduction magnetic circuit assembly, and air conduction coil, respectively.

[0118] Figure 10a This is a schematic diagram of the structure of the bone conduction sound-generating device 2 according to some embodiments of this specification. Figure 10b yes Figure 10a The diagram shows a cross-sectional view of the bone conduction sound-generating device 2. Figure 11This is a cross-sectional schematic diagram of a bone conduction sound-generating device 2 according to another embodiment. The bone conduction sound-generating device 2 includes a bone conduction support 20, a bone conduction magnetic circuit assembly 21, at least one bone conduction coil 22, and at least one spring 23. The bone conduction magnetic circuit assembly 21 and the bone conduction coil 22 are both disposed inside the bone conduction support 20. The spring 23 connects the bone conduction support 20 and the bone conduction magnetic circuit assembly 21. Optionally, the spring 23 is connected to the end face 202 of the bone conduction support 20. The bone conduction coil 22 surrounds the outside of the bone conduction magnetic circuit assembly 21 and is fixed relative to the bone conduction support 20. It is used to drive the bone conduction magnetic circuit assembly 21 to vibrate. The bone conduction magnetic circuit assembly 21 is connected to the bone conduction support 20 through the spring 23 and can be reset by the elastic force of the spring 23. The bone conduction sound-generating device 2 is connected to a face cover 1001 to transmit vibration to the face cover 1001. For example, it can be connected to the face cover 1001 through the bone conduction support 20, the spring 23, or the connector 12. In this specification, the stator of the bone conduction sound generating device 2 refers to the part that is stationary relative to the outer shell assembly 100 when the bone conduction sound generating device 2 is working, including components such as the bone conduction support 20 and the bone conduction coil 22. The vibrator of the bone conduction sound generating device 2 refers to the part that moves relative to the bone conduction support 20 when the bone conduction sound generating device 2 is working, including components such as the bone conduction magnetic circuit assembly 21 and the spring piece 23.

[0119] In some embodiments, the bone conduction support 20 is annular with open ends and surrounds the outside of the bone conduction magnetic circuit assembly 21 and the bone conduction coil 22. Optionally, the bone conduction support 20 is rectangular (the four corners can be rounded, right-angled, oblique, or other curved shapes that reduce the volume of the four corners), which facilitates its installation in the housing assembly 100 in conjunction with the air conduction sound generating device 3, and makes fuller use of the space within the housing assembly 100. It is understood that in other embodiments, the shape of the bone conduction support 20 can also be other shapes, such as annular, racetrack-shaped, etc. Figure 12 This shows a schematic diagram of a bone conduction sound-generating device 2 when the bone conduction support 20 is in the shape of a racetrack.

[0120] In some embodiments, the bone magnetic circuit assembly 21 includes at least one magnet 210 and at least two magnetic plates 211, with a magnet 210 connected between two adjacent magnetic plates 211. The N and S poles of the magnet 210, as well as the magnet 210 and the magnetic plates 211, are arranged along the vibration direction A of the bone magnetic circuit assembly 21. When the number of magnets 210 is greater than or equal to two, the polarities of the opposite magnetic poles of two adjacent magnets 210 are the same (i.e., like poles opposite each other). An annular bone magnetic gap 24 is formed between the bone magnetic circuit assembly 21 and the bone guide frame 20. A bone conduction coil 22 surrounds the outside of the magnetic plates 211 and is located within the bone magnetic gap 24 between the bone guide frame 20 and the bone magnetic circuit assembly 21. When alternating current is applied to the bone conduction coil 22, it drives the bone magnetic circuit assembly 21 to reciprocate, and the vibration is transmitted to the bone guide frame 20 and the faceplate 1001 through the spring 23. At least one or all of the magnetic plates 211 are surrounded by bone conduction coils 22. When all the magnetic plates 211 are surrounded by bone conduction coils 22, the number of bone conduction coils 22 corresponds to the number of magnetic plates 211. Optionally, at least two magnetic plates 211 are surrounded by a bone conduction coil 22 to increase the driving force of the bone conduction coils 22 and increase the volume. In other embodiments, only one magnetic plate 211 may be surrounded by a bone conduction coil 22.

[0121] Figure 10b , Figure 13a , Figure 14a , Figure 15a , Figure 16a , Figure 23a as well as Figure 23b A schematic diagram of the structure of a bone magnetic circuit assembly 21 according to some embodiments of this specification is shown.

[0122] Figure 10b , Figure 13a and Figure 23a In the illustrated embodiment, the bone magnetic circuit assembly 21 includes a magnet 210 and two magnetic plates 211 arranged along the vibration direction A, with the two magnetic plates 211 connected to both sides of the magnet 210. A bone conduction coil 22 surrounds the exterior of each of the two magnetic plates 211. Figure 10b , Figure 13a and Figure 23a The difference in the structures shown is that, Figure 10b The magnetic plate 211 shown is provided with a boss 2113 and a recess 2114. Figure 13a The magnetic guide plate 211 shown has a boss 2113 but no recess 2114. Figure 23a and Figure 23b A gasket 26 is connected to the magnetic plate 211 shown. Figure 23a and Figure 23b The difference lies in the structure of the bone magnetic circuit component 21.

[0123] Figure 14a In the illustrated embodiment, the bone magnetic circuit assembly 21 includes three magnets 210 arranged along the vibration direction A and two magnetic plates 211, with a magnetic plate 211 connecting adjacent magnets 210. Adjacent magnets 210 are arranged with their same poles facing each other. A bone conduction coil 22 surrounds the magnetic plate 211 located between adjacent magnets 210. Compared to a single-magnet structure, the three-magnet structure increases sensitivity.

[0124] Figure 15a In the illustrated embodiment, the bone magnetic circuit assembly 21 includes three magnets 210 and four magnetic plates 211 arranged along the vibration direction A, with a magnet 210 connecting each adjacent magnetic plate 211. Adjacent magnets 210 are arranged with their same poles facing each other. A bone conduction coil 22 surrounds the outer edge of the magnetic plate 211 located between adjacent magnets 210. Because the outermost part of the bone magnetic circuit assembly 21 is the magnetic plate 211, magnetic leakage is reduced.

[0125] Figure 16a In the illustrated embodiment, the bone magnetic circuit assembly 21 includes two magnets 210 arranged along the vibration direction A and three magnetic plates 211, with a magnet 210 connecting adjacent magnetic plates 211. Adjacent magnets 210 are arranged with their same poles facing each other. A bone conduction coil 22 surrounds the outer edge of the magnetic plate 211 located between adjacent magnets 210. Because the outermost part of the bone magnetic circuit assembly 21 is the magnetic plate 211, magnetic leakage is reduced.

[0126] It is understood that in other embodiments, the bone magnetic circuit assembly 21 may also include two magnets 210 arranged along the vibration direction A and a magnetic plate 211, with the two magnets 210 respectively connected to both sides of the magnetic plate 211, and a bone conduction coil 22 surrounding the outside of the magnetic plate 211.

[0127] The bone conduction magnetic circuit components 21 mentioned above can all be installed inside the bone conduction sound generating device 2 and assembled inside the sound generating unit 10, for example, Figure 11 and Figure 8c That is, respectively showing the... Figure 14a The bone conduction magnetic circuit assembly 21 shown is applied to the bone conduction sound generating device 2 and the sound generating unit 10.

[0128] The bone conduction support 20 of the bone conduction sound-generating device 2 will be illustrated with an example next.

[0129] The bone conduction scaffold 20 can be made of either a magnetic or non-magnetic material. The non-magnetic material can be a low-density, non-metallic material, such as plastic PC, ABS, PC+ABS, or PC+glass fiber. Using a non-magnetic material reduces the mass of the bone conduction sound generator 2 and decreases the stator mass, thereby improving the high-frequency sensitivity of the bone conduction sound generator 2. When the bone conduction scaffold 20 is made of a magnetic material (e.g., magnetic stainless steel), it increases the BL value (BL value reflects electromagnetic characteristics and is the product of magnetic field strength and coil wire length), reduces magnetic leakage, and improves mid-frequency sensitivity. Unless otherwise specified in this specification, the bone conduction scaffold 20 is made of a magnetic material. Optionally, the tensile strength of the magnetically conductive bone guide scaffold 20 is 430 MPa to 780 MPa, more preferably 450 to 600 MPa; the yield strength is >200 MPa; the elongation is >20%; and the chemical composition contains >50% iron and 15-20% chromium. This is beneficial for giving the bone guide scaffold 20 good strength, preventing breakage and deformation. The chromium content of the bone guide scaffold 20 helps improve corrosion resistance, strength and hardness, high-temperature performance, wear resistance, and magnetic conductivity, and also improves the effect of preventing magnetic leakage. For example, the material of the magnetically conductive bone guide scaffold 20 can be, for example, SUS430 and SUS304.

[0130] Figure 17 Simulation diagrams of the BL values ​​of the bone conduction sound-generating device according to some embodiments of this application with bone conduction supports 20 of different wall thicknesses are shown. During the simulation, only the wall thickness of the bone conduction support 20 changes, while other parameters remain constant. The magnet offset refers to the offset of the bone conduction magnetic circuit assembly 21 relative to its original position during vibration. When the bone conduction magnetic circuit assembly 21 deviates from its original position, the magnetic field strength at the bone conduction coil 22 also changes. As can be seen from the figures, the magnetically conductive bone conduction support 20 has a higher BL value than the non-magnetically conductive bone conduction support 20. With the increase of the wall thickness of the magnetically conductive bone conduction support 20, the BL value within the bone conduction gap 24 also increases overall. Figure 18 This is a simulation diagram showing the magnetic leakage of a bone conduction sound-generating device according to an embodiment of this application when bone conduction supports 20 of different wall thicknesses are installed. During the simulation, only the wall thickness of the bone conduction support 20 changes, while other parameters remain constant. The distance from the driver side refers to the distance along a direction perpendicular to the vibration direction A from the outer peripheral surface 2a of the bone conduction sound-generating device 2. The outer peripheral surface 2a refers to the outer surface of the bone conduction sound-generating device 2 located between its two end faces in the vibration direction A. As can be seen from the diagram, the overall magnetic leakage is smaller when the bone conduction support 20 is made of a magnetically conductive material compared to when it is made of a non-magnetically conductive material. Furthermore, the greater the wall thickness of the magnetically conductive bone conduction support 20, the smaller the magnetic leakage. Combined with... Figure 17 and Figure 18It is known that when the bone conduction scaffold 20 is too thin, its magnetic permeability is insufficient, resulting in high magnetic leakage and a low BL value. Conversely, if the bone conduction scaffold 20 is too thick, it will increase the mass of the bone conduction magnetic circuit assembly 21, causing a decrease in the high-frequency sensitivity of the bone conduction sound generation device 2 and a worse wearing experience. To balance wearing comfort and sound generation effect, in some embodiments, the wall thickness B1 of the bone conduction scaffold 20 is 0.3–0.5 mm. It is understood that the bone conduction scaffold 20 can have a uniform wall thickness or an unequal wall thickness, as long as the wall thickness B1 is within the defined range. The wall thickness B1 can be further selected as 0.35–0.45 mm, for example, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, or 0.5 mm.

[0131] like Figure 10a and Figure 10b As shown, the bone conduction coil 22 typically includes two leads 220 for current inflow and outflow. To facilitate the routing of the bone conduction coil 22, the bone conduction support 20 is provided with an outlet hole 201 for the leads 220 of the bone conduction coil 22 to pass through. Optionally, the outlet hole 201 is located on the outer wall 203 of the bone conduction support 20 facing the connection 111a between the ear hook 111 and the housing assembly 100, to facilitate wiring and routing. Further optionally, the outlet hole 201 communicates with the end face 202 of the bone conduction support 20, so that the leads 220 of the bone conduction coil 22 can pass through the outlet hole 201. For example, the leads 220 can be placed in the outlet hole 201 at the same time as the bone conduction coil 22 is installed, and then the spring clip 23 can be installed on the end face 202. The outlet hole 201 can make way for the exit of the bone conduction coil 22, preventing the bone conduction coil 22 from being damaged by the spring clip. Optionally, cable outlet holes 201 are symmetrically provided on both opposite side walls of the bone guide bracket 20 to prevent reverse installation and facilitate cable outlet.

[0132] The outlet holes 201 can reduce the mass of the stator portion of the bone conduction sound generator 2. Generally, the lighter the stator portion, the higher the mid-to-high frequency sensitivity of the bone conduction sound generator 2. Additionally, the outlet holes 201 connecting the inner and outer sides of the bone conduction support 20 allow for smoother airflow during vibration of the bone conduction magnetic circuit assembly 21, reducing echo and resulting in purer sound from the headphones. In some embodiments, the total area of ​​all outlet holes 201 accounts for 0.5% to 10% of the area of ​​the entire outer peripheral surface of the bone conduction support 20. This reduces the mass of the stator portion and improves mid-to-high frequency sensitivity. The outer peripheral surface of the bone conduction support 20 refers to the outer surface of the bone conduction support 20 located between its two end faces in the vibration direction A, which is essentially consistent with the outer peripheral surface of the bone conduction sound generator 2. Generally, a 0.5% area ratio of outlet holes 201 can reduce weight by approximately 5 mg, 1% by approximately 10 mg, and so on. Further optionally, the total area of ​​all outlet holes 201 accounts for 1% to 2% of the area of ​​the entire outer peripheral surface of the bone conduction support 20. While improving mid-to-high frequency sensitivity, it reduces magnetic leakage caused by excessively large area of ​​the outlet hole 201, and also helps to ensure the strength of the bone guide scaffold 20. The area of ​​the outer peripheral surface of the bone guide scaffold 20 refers to the sum of the areas of its outer side surfaces, including the area of ​​the outlet hole 201. When the outer peripheral surface of the bone guide scaffold 20 is approximately parallel to the axis of the bone guide scaffold 20, the area of ​​the outer peripheral surface can be obtained by multiplying the perimeter of the outer contour of the cross-section of the outer peripheral surface of the bone guide scaffold 20 by the height of the bone guide scaffold 20.

[0133] When the bone conduction sound-generating device 2 includes two or more bone conduction coils 22, the bone conduction coils 22 are connected in series, and the current directions in adjacent bone conduction coils 22 are opposite to reduce inductance and improve mid-to-high frequency sensitivity. The current direction in the bone conduction coil 22 can be changed by changing the winding direction. Figure 10a and Figure 10b In the illustrated embodiment, there are two bone conduction coils 22, which are connected in series with opposite current directions. The bone conduction sound-generating device 2 also includes an external circuit board 25 attached to the outer surface of the bone conduction support 20. The external circuit board 25 can be a flexible circuit board. Optionally, the external circuit board 25 is disposed on the outer side wall 203 of the bone conduction support 20 facing the connection 111a between the ear hook 111 and the outer shell assembly 100, facilitating connection with external wires (such as cables or wires mentioned below). Furthermore, the wire outlet 201 and the external circuit board 25 are disposed on the same outer side wall 203, facilitating the soldering of the leads 220 of the bone conduction coils 22 onto the external circuit board 25. It is understood that the current direction within the bone conduction coils 22 can also be changed by altering the connection position of the coil leads to the solder pads on the external circuit board 25 and the circuit design on the external circuit board 25. In some embodiments, the external circuit board 25 and the cable outlet 201 are located at one end of the bone guide bracket 20 along its length, and the cable outlet 201 is not adjacent to the diaphragm 321.

[0134] The following example illustrates the spring 23 of the bone conduction sound-generating device 2.

[0135] The number of spring clips 23 can be one, two, or more. In some embodiments, such as Figure 10a and Figure 10b As shown, the bone conduction sound-generating device 2 includes two spring plates 23, which are spaced apart along the vibration direction A. Optionally, the two spring plates 23 are respectively disposed at both ends of the bone conduction magnetic circuit assembly 21 along the vibration direction A, which can improve the stability of vibration and help prevent the bone conduction magnetic circuit assembly 21 from swinging (or rolling) during vibration, thereby reducing the risk of it impacting side components. The spring plate 23 is generally sheet-shaped, and its thickness B2 is 0.1mm to 0.25mm, and can be further selected as 0.13mm to 0.2mm. (Reference) Figure 19 The spring piece 23 includes an outer frame 230, an inner frame 231 located inside the outer frame 230, and at least two elastic arms 232 connecting the outer frame 230 and the inner frame 231. The outer frame 230 is connected to the bone guide support 20, and optionally, the spring piece 23 is attached to the end face 202 of the bone guide support 20. The outer frame 230 and the bone guide support 20 can be connected by adhesive or welding. For example, the outer frame 230 and the end face 202 are connected by welding. The bonding strength of welding is better than that of adhesive, making the elastic coefficient of the spring piece 23 more stable, which is beneficial to the stability of the low-frequency F0 of the bone guide sound generating device 2. The welding method can be spot welding or wire welding, preferably wire welding. Wire welding can reduce welding slag, thereby preventing welding slag from entering the product and generating noise, and the welding strength is stronger than spot welding or adhesive, which is beneficial to enhancing reliability.

[0136] In some embodiments, the outer frame 230 and inner frame 231 of the spring clip 23 are flush, which facilitates manufacturing. In other embodiments, refer to... Figure 20a and Figure 20b , Figure 20a and Figure 20b These are cross-sectional schematic diagrams of two different sections of a spring clip according to one embodiment, wherein, Figure 20a The cross-section passes through the center of the inner frame 231 and is perpendicular to the width direction of the spring piece. Figure 20bThe cross-section of the spring piece 23 passes through the center of the inner frame 231 and is perpendicular to the length direction of the spring piece 23. The outer frame 230 and the inner frame 231 of the spring piece 23 are spaced apart along the thickness direction of the spring piece 23 (consistent with the vibration direction A). When the spring piece 23 is installed on the bone guide support 20, the inner frame 231 is recessed into the bone guide support 20 relative to the outer frame 230, and is closer to the bone magnetic circuit assembly 21 in the vibration direction A. In this way, the portion of the bone guide support 20 extending beyond the bone magnetic circuit assembly 21 along the vibration direction A is larger, which can achieve better magnetic conduction and reduce magnetic leakage. In addition, when the bone magnetic circuit assembly 21 vibrates, the portion extending beyond the bone guide support 20 is smaller, which can reduce the risk of the oscillator colliding with external components. Optionally, the spacing D11 between the outer frame 230 and the inner frame 231 along the vibration direction A is 0.35 to 0.8 mm, and more preferably 0.4 to 0.65 mm.

[0137] Optional, further reference Figure 21 The distance D11 between the outer frame 230 and the inner frame 231 is greater than the maximum amplitude of the bone conduction magnetic circuit assembly 21 when the bone conduction sound generator 2 is working. This means that when the bone conduction sound generator 2 is working, the inner frame 231 will not extend beyond the upper surface of the outer frame 230, preventing the spring piece 23 from impacting the external area of ​​the bone conduction sound generator 2 and generating noise. This facilitates the installation of the bone conduction sound generator 2, eliminating the need for clearance space at both ends of the vibration direction. The maximum amplitude refers to the maximum vibration amplitude of one side of the spring piece 23 within the frequency range of 20Hz to 20KHz when a voltage of 0.5Vrms is input to the bone conduction sound generator 2. In some embodiments, the maximum amplitude of the bone conduction magnetic circuit assembly 21 when working is 0.2 to 0.7 mm. In this case, the distance D11 between the outer frame 230 and the inner frame 231 can be 0.35 to 0.8 mm. If the maximum amplitude is too small, the sensitivity will be insufficient; if the amplitude is too large, noise will easily be generated. Setting the maximum amplitude to 0.2–0.7 mm helps to ensure sensitivity and reduce noise. Further optionally, the maximum amplitude of the bone magnetic circuit assembly 21 during operation is 0.3–0.5 mm. In this case, the spacing D11 between the outer frame 230 and the inner frame 231 can be 0.4–0.65 mm. Optionally, the ratio of the spacing D11 to the maximum amplitude of the bone magnetic circuit assembly 21 is 1.05–1.5 to better ensure that the bone magnetic circuit assembly 21 does not extend beyond the upper surface of the outer frame 230.

[0138] The bone conduction magnetic circuit assembly 21 of the bone conduction sound generation device 2 will be illustrated with an example next.

[0139] In some embodiments, reference Figure 10b The thickness B7 of magnet 210 is 1.8mm to 3.2mm, and can be further selected as 2.2mm to 2.8mm. Figure 22A simulation diagram of the BL value of the bone conduction sound-generating device 2 according to an embodiment of this specification is shown when magnets 210 of different thicknesses are installed. During the simulation, the total thickness of the bone conduction magnetic circuit assembly 21 remains constant at 3.8 mm (excluding the thickness of the boss 2113). The thickness B7 of the magnet 210 varies, and the thickness B8 of the magnetic guide plate 211 (also including the thickness of the boss 2113) varies with the thickness of the magnet 210. As can be seen from the figure, the BL value increases overall as the thickness of the magnet 210 increases. However, when the thickness of the magnet 210 is 3.2 mm, the BL value decreases to some extent. This is because the magnet 210 becomes too thick, and the thinner magnetic guide plate 211 results in poorer magnetic permeability. Understandably, if the magnet 210 is too thin, the magnetic field it provides will be insufficient; if it is too thick, the thickness of the magnetic guide plate 211 will be insufficient, resulting in poor magnetic permeability. Simultaneously thickening both the magnet 210 and the magnetic guide plate 211 will increase the thickness of the bone conduction magnetic circuit assembly 21, thereby increasing the size and weight of the bone conduction sound-generating device 2. By setting the thickness B7 of the magnet 210 to 2.2mm–2.8mm, a higher BL value can be provided while avoiding significant magnetic leakage. Optionally, the thickness B8 of the magnetic guide plate 211 can be 0.3mm–0.8mm. The thickness of the magnetic guide plate 211, excluding the thickness of the boss 2113, can be further selected as 0.5mm–0.65mm to ensure a suitable thickness, guaranteeing magnetic permeability and reducing magnetic leakage. The thicknesses B7 of the magnet 210 and B8 of the magnetic guide plate 211 refer to the thickness of a single magnet 210 and a single magnetic guide plate 211, respectively.

[0140] When the thickness of magnet 210 is 2.2mm, 2.4mm, 2.6mm, 2.8mm, 3mm, and 3.2mm, the ratio of magnet 210 to a single magnetic plate 211 is shown in the table below:

[0141] Magnet thickness The ratio of the magnet to a single magnetic plate 2.2mm 2.75 2.4mm 3.42 2.6mm 4.33 2.8mm 5.6 3mm 7.5 3.2mm 10.66

[0142] Optionally, the thickness ratio of the magnet 210 to the magnetic guide plate 211 is 3 to 6. Within this range, the bone magnetic circuit assembly 21 can provide a high BL value. Further optionally, the thickness ratio of the magnet 210 to the magnetic guide plate 211 is 3.5 to 4.5 to further ensure the BL value.

[0143] The connection between the bone magnetic circuit assembly 21 and the inner frame 231 will be illustrated with an example.

[0144] In some embodiments, the bone magnetic circuit assembly 21 includes a spacer connected to the inner frame 231. The spacer separates the magnet assembly (the assembly formed by connecting the magnet 210 and the magnetic plate 211) from the outer end face 2116 of the inner frame 231 and the inner frame 231. This allows for a larger radial dimension of the magnet assembly and prevents the elastic arm 232 from contacting the magnet assembly during vibration, thus avoiding collision noise. In embodiments where the inner frame 231 and outer frame 230 of the spring piece 23 are spaced apart along the vibration direction A, the inner frame 231 can be directly connected to the magnetic plate 211 without a spacer. It is understood that the spacer can increase the distance D15 by which the bone guide support 20 extends beyond the outer end face 2116 of the outermost magnetic plate 211 along the vibration direction A, thereby reducing magnetic leakage. Optionally, along the vibration direction A, the distance D15 of the bone conduction support 20 extending beyond the outer end face 2116 of the outermost magnetic guide plate 211 is 0.4–1.5 mm to effectively reduce magnetic leakage and allow more magnetic lines of force to pass through the bone conduction support 20, reducing the dissipation of magnetic lines of force and thus increasing the BL value. Further, optionally, the distance D15 of the bone conduction support 20 extending beyond the outer end face 2116 of the outermost magnetic guide plate 211 is 0.5–1.2 mm to ensure the anti-magnetic leakage effect without excessively increasing the volume of the bone conduction sound generating device 2. The distance D15 of the bone conduction support 20 extending beyond the outermost magnetic guide plate 211 can be adjusted by spacers, or by the offset between the inner frame 231 and the outer frame 230 of the spring piece 23, or by a combination of these two methods or other methods.

[0145] The thickness of the spacer can be 0.2–0.5 mm to ensure a reasonable gap between the elastic arm 232 and the outer end face 2116, preventing noise generation. The spacer can be circular, elliptical, rectangular, or racetrack-shaped, and the material can be, for example, plastic or stainless steel.

[0146] In some embodiments, such as Figure 10b As shown, the spacer is a boss 2113 protruding from the middle of the magnetic plate 211. The boss 2113 is integrally formed with the magnetic plate 211 and protrudes from the outer end face 2116 of the magnetic plate 211 (see label). Figure 13aOptionally, a boss 2113 is formed in the middle of the stamped magnetic guide plate 211, and a recess 2114 is formed on the surface of the magnetic guide plate 211 facing away from the boss 2113 (i.e., the inner end face 2115) at the position corresponding to the boss 2113. It is understood that stamping can efficiently form both the boss 2113 and the recess 2114 simultaneously, but this does not mean that stamping is the only method for forming both. The boss 2113 is connected to the inner frame 231, for example, by welding or bonding. Welding is generally more robust than bonding. The protrusion height H1 (i.e., the thickness of the spacer) of the boss 2113 is 0.2–0.5 mm, thereby ensuring a reasonable distance between the elastic arm 232 and the boss 2113 and preventing noise generation. Optionally, the depth H2 of the recess 2114 is 0.2 to 0.5 mm. The recess 2114 can be used to store adhesive, further reducing the noise caused by adhesive overflowing to the edge and colliding with the bone conduction coil 22 when the magnetic plate 211 and the magnet 210 are glued together.

[0147] In some embodiments, reference Figure 23a and Figure 23b , Figure 23a The intermediate spacer is a gasket 26 connected to the magnetic plate 211 and the inner frame 231. The gasket 26 creates a gap between the elastic arm 232 and the magnetic plate 211. Figure 23b In this design, the spacer is a pad 26 connected to the magnet 210 and the inner frame 231. The pad 26 creates a gap between the elastic arm 232 and the magnet 210. In this case, the magnetic plate 211 can be flat without a recess 2114 to simplify the manufacturing process; however, a recess 2114 can also be provided. The pad 26 can be made of a magnetically conductive material or a non-magnetically conductive material, such as plastic or metal. The pad 26 and the inner frame 231 can be connected by welding, bonding, or a hot-melt column connection. For example, the pad 26 can have a hot-melt column passing through the inner frame 231, which fixes the pad 26 and the inner frame 231 together. The thickness H3 of the pad 26 is the thickness of the spacer.

[0148] It is understandable that the bone magnetic circuit assembly 21 can be composed of multiple parts connected together (split type), or it can be integrally magnetized if the structure allows. When it is composed of multiple parts connected together, the magnet 210 and the magnetic plate 211 are independent parts, and the independent parts are connected by adhesive or other means to form the bone magnetic circuit assembly 21. When the bone magnetic circuit assembly 21 is integrally magnetized, the bone magnetic circuit assembly 21 is a single part (integral type), and the magnet 210 and the magnetic plate 211 are part of the part, without the need for a connecting process to form the bone magnetic circuit assembly 21. Therefore, the integrally magnetized bone magnetic circuit assembly 21 usually has higher dimensional accuracy. It should be noted that the bone magnetic circuit assembly 21 being integral means that at least the magnet 210 and the magnetic plate 211 constitute a single integral part. The spacer used by the bone magnetic circuit assembly 21 to connect with the spring 23 can be an independent part or integral with it. For example, Figure 13b , Figure 14b , Figure 15b and Figure 16b They respectively showed the same as Figure 13a , Figure 14a , Figure 15a and Figure 16a The diagram shows a schematic of a single-piece bone magnetic circuit assembly corresponding to a separate bone magnetic circuit assembly. Solid lines indicate the boundary between the two independent parts, while dashed lines indicate the boundary between different parts (magnetic plate 211 and magnet 210) within the single-piece assembly. Figure 14b and Figure 16b The spacer (shim 26) is a separate part. Figure 13b and Figure 15b The spacer (protrusion 2113) is integrated with the bone magnetic circuit assembly. For the method of integrated magnetization, please refer to the patent document with application number 202111062238.3, the entire contents of which are incorporated herein by reference.

[0149] The following example illustrates the air-conducting sound-generating device 3 of the sound-generating unit 10.

[0150] In some embodiments, such as Figures 24 to 26 , Figures 30 to 33As shown, the air-conducting sound-generating device 3 includes an annular air-conducting support 30 and an air-conducting magnetic circuit assembly 31 and a diaphragm assembly 32, both connected to the air-conducting support 30. The air-conducting support 30 can be made of a lightweight material (e.g., plastic) to reduce the mass and density of the air-conducting sound-generating device 3. Optionally, the air-conducting support 30 is non-magnetic. The diaphragm assembly 32 includes an air-conducting coil 320 located within the magnetic field of the air-conducting magnetic circuit assembly 31 and a diaphragm 321 connected between the air-conducting coil 320 and the air-conducting support 30. When an alternating current is passed through the air-conducting coil 320, it will generate an interaction force with the magnetic field of the air-conducting magnetic circuit assembly 31, thereby driving the diaphragm 321 to vibrate.

[0151] Next, we will first give an example of the air-conducting magnetic circuit component 31 of the air-conducting sound-generating device 3.

[0152] The air-conducting magnetic circuit assembly 31 includes at least a magnetically conductive support 310 connected to the bottom of the air-conducting bracket 30, a main magnet 311 disposed on the surface of the magnetically conductive support 310 facing the diaphragm assembly 32, and a main pole core plate 313 connected to the main magnet 311.

[0153] The magnetically conductive support 310 is made of a magnetically conductive material and includes a plate-shaped magnetically conductive base plate 3100. Optionally, the thickness of the magnetically conductive base plate 3100 is 0.3–0.6 mm to provide good magnetic conductivity and help prevent magnetic leakage. In some embodiments, reference is made to… Figure 26 and Figure 31 The magnetic support member 310 also includes a magnetic side plate 3101 protruding from the side edge of the magnetic base plate 3100 toward the diaphragm assembly 32. The magnetic side plate 3101 extends at least partially to be disposed opposite to the main pole core plate 313, and there is a gap between it and the main pole core plate 313, thereby forming an air-conducting magnetic gap 315. Optionally, the magnetic base plate 3100 is rectangular, and the magnetic side plate 3101 can be provided on only two opposite sides of the magnetic base plate 3100, or on all four sides of the magnetic base plate 3100. A magnetic ring 3102 can also be provided on the magnetic base plate 3100. Figures 27 to 29 This is a top view of the magnetic support 319 according to some embodiments of the present invention, so as to show the position and number of the magnetic side plates 3101. Figure 27 In the illustrated embodiment, a magnetically conductive side plate 3101 is provided at each of the two short sides of the magnetically conductive base plate 3100. Figure 28 In the illustrated embodiment, a magnetically conductive side plate 3101 is provided on each of the two long sides of the magnetically conductive base plate 3100. Figure 29 In the illustrated embodiment, a magnetically conductive side plate 3101 is provided on each of the four sides of the magnetically conductive base plate 3100. It is understood that, in addition to being relatively independent, each magnetically conductive side plate 3101 can also be connected in a ring shape; in some embodiments, such as... Figures 30 to 33 As shown, Figure 31yes Figure 30 The cross-sectional view of the air-conducting sound-generating device 2 shown. Figure 32 yes Figure 31 Enlarged view of Part III, Figure 33 yes Figure 30 The image shows a perspective view of the magnetic support 310, main magnet 311, and main pole plate 313 connected together. The magnetic support 310 includes a magnetic base plate 3100 and a magnetic ring 3102 protruding from the side edge of the magnetic base plate 3100 toward the diaphragm assembly 32. The magnetic ring 3102 is formed by connecting four magnetic side plates 3101. The magnetic ring 3102 surrounds the outside of the main pole plate 313, forming an air-conducting magnetic gap 315, into which an air-conducting coil 320 extends.

[0154] In some embodiments, reference Figure 34 , Figure 34 For along Figure 26 The cross-sectional view obtained by the JJ section line shows that the air-conducting magnetic circuit assembly 31 also includes a secondary magnet 312 connected to the magnetically conductive base plate 3100 to increase the BL value of the air-conducting coil 320. The number of secondary magnets 312 can be one or more. Optionally, the number of secondary magnets 312 is even, with two opposing secondary magnets 312 located on opposite sides of the main magnet 311. In some embodiments, the air-conducting magnetic circuit assembly 31 also includes a secondary pole plate 314 connected to the secondary magnets 312. Optionally, at least one secondary pole plate 314 is connected to the surface of each secondary magnet 312 facing the diaphragm assembly 32 to improve the magnetic conductivity. The secondary pole core plate 314 and the main pole core plate 313 are at least partially arranged opposite each other, and an air-conducting magnetic gap 315 is formed between the secondary pole core plate 314 and the main pole core plate 313. Optionally, the distance between each secondary magnet 312 and the main magnet 311 is the same. Further optionally, the distance between each secondary pole core plate 314 and the main pole core plate 313 is the same, so that the air-conducting magnetic gap 315 is basically of equal width and the magnetic field distribution in the magnetic gap is more uniform. Figures 35 to 37 This is a top view of the air-conducting magnetic circuit assembly 31 to show the position and number of the sub-pole core plate 314 and the sub-magnet 312. Figure 35 In the illustrated embodiment, a secondary magnet 312 and a secondary pole plate 314 are respectively provided at the two short sides of the magnetic base plate 3100. Figure 36 In the illustrated embodiment, a secondary magnet 312 and a secondary pole plate 314 are respectively provided on the two long sides of the magnetic base plate 3100. Figure 37In the illustrated embodiment, a secondary magnet 312 and a secondary pole plate 314 are respectively provided on each of the four sides of the magnetically conductive base plate 3100. Optionally, the two ends of the secondary pole plate 314 extend beyond the two ends of the secondary magnet 312 in the length direction to further improve the magnetic conductivity. The distance L9 by which the secondary pole plate 314 extends beyond the secondary magnet 312 in the length direction can be 0.03 to 0.2 mm. Optionally, the two ends of the secondary pole plate 314 extend beyond the secondary magnet 312 by the same distance.

[0155] The magnetic poles of the main magnet 311 are arranged along the vibration direction B of the air-conducting sound-generating device 3, and the magnetic poles of the auxiliary magnet 312 are also arranged along the vibration direction B, but in the opposite direction to the magnetic poles of the main magnet 311. It can be understood that the vibration direction B of the air-conducting sound-generating device 3 is consistent with the vibration direction of the diaphragm 321. The auxiliary magnet 312 enhances the magnetic field strength and increases the BL value, thereby improving the sensitivity of the air-conducting sound-generating device 3. The auxiliary pole core plate 314 guides the magnetic field lines, and its cooperation with the main pole core plate 313 allows the magnetic field lines of the main magnet 311 and the auxiliary magnet 312 to pass more concentratedly through the air-conducting coil 320 of the diaphragm assembly 32, improving the driving force and sensitivity.

[0156] It is understood that a magnetically conductive side plate 3101 may or may not be provided on the outer side of the auxiliary magnet 312. Optionally, when the auxiliary magnet 312 is provided on one side of the main magnet 311, the magnetically conductive side plate 3101 is not provided on that side to reduce weight and size. In some embodiments, such as Figure 38 As shown, Figure 38 It shows Figure 24 A schematic diagram of the air-conducting magnetic circuit assembly 31 of the air-conducting sound-generating device 3. Magnetic guide plates 3101 are provided on both short sides of the magnetic base plate 3100, but not on the long side. A secondary magnet 312 is correspondingly provided on the long side of the magnetic base plate 3100. Optionally, the distance between the magnetic guide plate 3101 and the main pole core plate 313 is the same as the distance between the secondary pole core plate 314 and the main pole core plate 313, so that the width of the air-conducting gap 315 around the main magnet 311 is consistent, resulting in more balanced vibration.

[0157] In some embodiments, reference Figure 32 , Figure 34 and Figure 39The thickness B4 of the main magnet 311 is 0.7–1.4 mm, and the thickness B10 of the main pole core plate 313 is 0.2–0.4 mm. When the main magnet 311 is too thin, the magnetic field it provides is weak; when the main magnet 311 is too thick, due to space limitations, the thickness of the main pole core plate 313 is insufficient, resulting in poor magnetic permeability. The set thicknesses of the main magnet 311 and the main pole core plate 313 help to achieve a balance, thereby providing a high BL value while avoiding significant magnetic leakage, thus contributing to improved speaker efficiency and sound quality. Further optionally, the thickness B4 of the main magnet 311 is 0.9–1.2 mm to further ensure the effect. Further optionally, the thickness ratio of the main magnet 311 to the main pole core plate 313 is 3–5.5. The main function of the main pole core plate 313 is to concentrate and guide the magnetic field. An appropriate ratio (3–5.5) ensures that the magnetic field generated by the magnet is effectively concentrated and guided by the main pole core plate 313 to the air-conducting magnetic gap 315 where the air-conducting coil 320 is located, thereby increasing the magnetic flux density in the air-conducting magnetic gap 315. The higher magnetic flux density increases the magnetic force on the air-conducting coil 320, thereby enhancing the driving force and enabling the diaphragm 321 to produce larger and more precise vibrations, thereby improving the sensitivity and output power of the air-conducting sound-generating device 3.

[0158] The diaphragm assembly 32 of the air-conducting sound-generating device 3 will be illustrated with an example next.

[0159] like Figure 32 , Figure 39 , Figure 40 and Figure 41 As shown, the diaphragm 321 includes an outer ring plate 3210 connected to the air conduction support 30, a flat intermediate plate 3211 located within the outer ring plate 3210, and a folded ring portion 3212 located between the outer ring plate 3210 and the intermediate plate 3211, the folded ring portion 3212 sealing the area between the outer ring plate 3210 and the intermediate plate 3211. The outer ring plate 3210 can be directly or indirectly connected to the air conduction support 30, and the two are relatively fixed. The cross-section of the folded ring portion 3212 is arc-shaped, and it can be recessed towards the side where the air conduction magnetic circuit assembly 31 is located (see reference). Figure 39 and Figure 41 It can also protrude in the direction away from the side where the air-conducting magnetic circuit assembly 31 is located (see reference). Figure 32 and Figure 40 Optionally, the outer ring 3210 is connected to the end face 300 of the air conduction support 30, for example, by adhesive bonding (e.g., glue bonding or double-sided tape bonding).

[0160] One end of the air-conducting coil 320 is connected to the middle plate 3211 of the diaphragm 321, and the other end extends into the air-conducting magnetic gap 315. It surrounds the outside of the main pole core plate 313 and is located inside the magnetically conductive side plate 3101. The main pole core plate 313 and the magnetically conductive side plate 3101 can guide and converge magnetic field lines, making the magnetic field lines pass through the coil more concentratedly and evenly, thereby improving sensitivity and driving force. When an alternating current is passed through the air-conducting coil 320, it will reciprocate under the interaction with the magnetic field, thereby driving the diaphragm 321 to vibrate, and the diaphragm 321 drives the air to vibrate and produce sound.

[0161] Optional, such as Figure 32 and Figure 39 As shown, the distance L6 from the intermediate plate 3211 to the main pole core plate 313 is 0.4–0.8 mm, and the distance L7 from the air-conducting coil 320 to the magnetic base plate 3100 is 0.4–0.8 mm. Both distances L6 and L7 are greater than the maximum amplitude of the diaphragm 321 when the air-conducting sound generator 3 is working. This avoids collisions between the diaphragm 321 and the main pole core plate 313, and between the air-conducting coil 320 and the magnetic base plate 3100, thus reducing sound distortion and noise, and extending the service life of the air-conducting sound generator 3. The maximum amplitude refers to the maximum single-sided vibration amplitude of the diaphragm 321 within the frequency range of 20 Hz to 20 kHz when a voltage of 0.5 Vrms is input to the air-conducting sound generator 3. Optionally, the ratio of distance L6 to distance L7 ranges from 0.8 to 1.2, meaning that distances L6 and L7 are relatively close. This reduces the size of the vibration direction B of the air-conducting sound-generating device 3. Furthermore, when not energized, the distance between the geometric center of the air-conducting coil 320 and the geometric center of the magnetic plate 313 is closer, making the positions of the main magnetic field lines and the air-conducting coil 320 more symmetrical. This results in similar vertical amplitudes of the air-conducting coil 320 when energized, reducing distortion, improving sound reproduction, and thus enhancing sound quality. Further, the ratio of distance L6 to distance L7 ranges from 0.9 to 1.1; even further, the two distances are equal. Optionally, the maximum amplitude of the air-conducting sound-generating device 3 is 0.2 to 0.7 mm, and further, 0.3 to 0.5 mm. If the amplitude is too small, the sensitivity is insufficient; if the amplitude is too large, noise is easily generated. If the ratio is too small, the margin is insufficient, easily generating noise; if it is too large, it will result in wasted space. Alternatively, the difference between the distances L6 and L7 and the maximum amplitude of the diaphragm 321 is 0.1 to 0.3 mm.

[0162] In some embodiments, reference Figure 26 and Figure 40To enhance the strength of the intermediate sheet 3211 and improve the sound quality, the diaphragm assembly 32 further includes a reinforcing sheet 3213 attached to the surface of the intermediate sheet 3211. The material of the reinforcing sheet 3213 can be the same as or different from the material of the diaphragm 321. Optionally, the reinforcing sheet 3213 and the intermediate sheet 3211 have the same shape and area, and its projection along the thickness direction of the reinforcing sheet 3213 coincides with that of the intermediate sheet 3211, so as to comprehensively reinforce the intermediate sheet 3211. Optionally, the thickness of the reinforcing sheet 3213 is 0.08-0.3 mm, and the material of the reinforcing sheet 3213 is a polymer, a metal, or a composite of a polymer and a metal. The polymer can be, for example, polyethylene, polypropylene, polyester, polyetherimide, polyethylene terephthalate, carbon fiber composite material, or pulp fiber composite material; the metal can be, for example, aluminum, aluminum alloy, titanium, titanium alloy, a composite of aluminum-based material and foamed material, or a composite of titanium-based material and foamed material. Composites of polymers and metals can be, for example, aluminum-layered carbon fiber composites. It is understood that when the reinforcing sheet 3213 is provided, the intermediate sheet 3211 may not be fully enclosed, such as... Figure 40 As shown, Figure 40 This is an exploded view of a diaphragm 321 and a reinforcing sheet 3213 according to one embodiment. The intermediate sheet 3211 has an opening 32110 in the middle. After the reinforcing sheet 3213 is connected to the intermediate sheet 3211, the opening is sealed, which can reduce the weight of the diaphragm assembly 32.

[0163] In some embodiments, reference Figure 26 and Figure 39 The air-conducting sound-generating device 3 also includes a pressure cap 33, which is annular and connected to the surface of the outer ring plate 3210. It extends to be positioned opposite the folded ring portion 3212, thereby protecting the inner folded ring portion 3212. The pressure cap 33 also has a flat outer end face 330, which can be connected to the housing assembly 100. For example, adhesive can be applied to the outer end face 330 or double-sided adhesive tape 331 can be used to bond it to the housing assembly 100. Figure 42 The illustration shows the case where double-sided adhesive 331 is provided on the outer end face 330.

[0164] It is understood that in embodiments where the air-conducting sound-generating device 3 does not include the pressure cap 33, the outer ring plate 3210 can be connected to the housing 1000, allowing the diaphragm 321 to seal the front cavity 10042. For example, in embodiments where the side shell portion 1004 does not have a mounting groove 10041, the outer ring plate 3210 can be connected to the inner wall of the side shell portion 1004; in embodiments where the side shell portion 1004 has a mounting groove 10041, the outer ring plate 3210 can be connected to the bottom surface 10043 of the groove. In embodiments where the air-conducting sound-generating device 3 includes the pressure cap 33, the pressure cap 33 can be connected to the housing 1000, allowing the air-conducting sound-generating device 3 to seal the front cavity 10042. For example, in an embodiment where the side shell 1004 does not have a mounting groove 10041, the pressure cap 33 can be connected to the inner wall of the side shell 1004. In an embodiment where the side shell 1004 has a mounting groove 10041, the pressure cap 33 can be connected to the bottom surface 10043 of the groove.

[0165] The following example illustrates the prevention of magnetic interference between the bone conduction sound generator 2 and the air conduction sound generator 3.

[0166] In some embodiments, the maximum magnetic leakage at the outer peripheral surface 2a of the bone conduction sound generator 2 is less than the magnetic leakage at the end faces 2b along the vibration direction A. This helps to reduce interference with the air conduction sound generator 3. In addition, the electronic components corresponding to the position of the outer peripheral surface 2a of the bone conduction sound generator 2 can usually be set close to the bone conduction support 20 and may have an overlapping area in the vibration direction A (e.g., set opposite to the outer peripheral surface of the bone conduction support 20). The bone conduction sound generator 2 has a certain vibration space reserved between itself and the electronic components in the vibration direction A, and the distance is relatively large, so the impact on the electronic components is relatively small. Setting the magnetic leakage at the end face 2b of the bone conduction sound generator 2 to be greater than the magnetic leakage at its outer peripheral surface 2a can reduce the impact of magnetic leakage on external components and reduce the difficulty of preventing magnetic leakage.

[0167] Furthermore, the maximum magnetic leakage at the bottom surface 3b of the air-conducting sound generator 3 is less than the maximum magnetic leakage at the outer peripheral surface 2a of the bone-conducting sound generator 2, thus resulting in relatively less interference with the bone-conducting sound generator 2. Additionally, it is understandable that... Figure 8aIn the illustrated embodiment, the magnetic base plate 3100 of the air-conducting sound-generating device 3 faces the internal space of the outer shell assembly 100. The magnetic shielding effect of the magnetic base plate 3100 and the bone conduction support 20 can reduce the magnetic field leaking into the outer shell assembly 100, thus minimizing the impact of magnetic leakage on other electronic components. The magnetic base plate 3100 of the air-conducting sound-generating device 3 is positioned opposite to the bone conduction support 20 of the bone conduction sound-generating device 2. The magnetic base plate 3100 is closer to the bone conduction sound-generating device 2 than the diaphragm assembly 32, providing a certain degree of magnetic shielding and effectively reducing mutual interference from magnetic leakage. When the bone conduction support 20 is also magnetic, the magnetic shielding effect can be further improved. It is understood that when subjected to significant magnetic leakage interference, the originally uniform magnetic field may become unbalanced, affecting the vibration balance of the vibrating components; additionally, the opposite magnetic field direction may cancel out some of the magnetic field, resulting in a decrease in BL (bulk magnetic field). Therefore, reducing the mutual interference of leakage magnetic field helps to ensure that the vibrating parts of the bone conduction sound generator 2 and the air conduction sound generator 3 can vibrate smoothly, thus ensuring the reliability of the operation and the sound generation effect.

[0168] The magnetically conductive side plate 3101 of the air-conducting sound-generating device 3 can reduce magnetic field leakage from the side of the air-conducting sound-generating device 3. Generally, the more magnetically conductive side plates 3101 there are, the less magnetic field leakage there will be. Optionally, multiple magnetically conductive side plates 3101 are connected in a ring (i.e., magnetic ring 3102) to further reduce lateral magnetic leakage of the air-conducting sound-generating device 3. Further optionally, the magnetically conductive side plates 3101 are at least partially located within the mounting groove 10041, so that the lateral magnetic leakage of the air-conducting sound-generating device 3 has less impact on the components within the housing assembly 100.

[0169] In some embodiments, at the outer peripheral surface 2a of the bone conduction sound generator 2 (which is substantially consistent with the outer peripheral surface of the bone conduction support 20), the maximum magnetic leakage range is 10mT to 200mT; at the end face 2b of the bone conduction sound generator 2 in the vibration direction A (i.e., the plane where the outer end face of the outer frame 230 of the spring piece 23 is located), the maximum magnetic leakage range is 20mT to 300mT, so as to reduce the influence on the electronic components outside the bone conduction sound generator 2. The magnitude of the magnetic leakage can be adjusted by controlling the thickness and material of the bone conduction support 20, the magnetic plate 211 and / or the magnet 210. For example, the thicker the bone conduction support 20, the smaller the lateral magnetic leakage; the thicker the magnetic plate 211 and the thinner the magnet 210, the smaller the magnetic leakage at the end face is generally.

[0170] It is understandable that changes in thickness will also alter the mass of each part of the bone conduction sound generator 2 and the magnetic properties of the magnetic circuit, thereby affecting the sound generation effect of the bone conduction sound generator 2 (e.g., affecting its low-frequency F0 and sensitivity parameters). Further, optionally, the maximum magnetic leakage range at the outer peripheral surface 2a of the bone conduction sound generator 2 is 30mT to 150mT, and the maximum magnetic leakage range at the end face 2b of the bone conduction sound generator 2 in the vibration direction A is 40mT to 250mT, so that the bone conduction support 20, the magnetic plate 211, and the magnet 210 of the bone conduction sound generator 2 can be within a suitable size range, thereby reducing magnetic leakage while ensuring the sound generation effect of the bone conduction sound generator 2, and also making it easier to keep its mass and volume within a suitable range.

[0171] The magnitude of magnetic leakage can be measured using a Tesla meter (or Gauss meter). Specifically, the probe is moved along the outer peripheral surface 2a of the bone guide frame 20 while remaining in close contact with the surface, circling the outer peripheral surface 2a once. The maximum value is taken as the maximum magnetic leakage value at the outer peripheral surface 2a. When the outer peripheral surface has a stepped structure (e.g., Figure 32 As shown, measurements are taken on the outermost surface of the bone guide scaffold 20. Similarly, the probe is moved within the plane of end face 2b while in close contact with the end face 2b, and the maximum value is taken as the maximum leakage magnetic field value at end face 2b.

[0172] In some embodiments, the maximum magnetic leakage range at the outer peripheral surface 3a of the air-conducting sound generator 3 (which is substantially consistent with the outer peripheral surface of the air-conducting support 30) is 10mT to 120mT, and at the bottom surface 3b of the air-conducting sound generator 3, the maximum magnetic leakage range is 20 to 150mT. The outer peripheral surface of the air-conducting sound generator 3 refers to the outer surface located between the two end surfaces in its vibration direction B. The bottom surface 3b of the air-conducting sound generator 3 refers to the relatively more outwardly convex surface of the air-conducting support 30 and the magnetically conductive support 310. Optionally, the bottoms of the air-conducting support 30 and the magnetically conductive support 310 are flush, with the bottom surface 3b facing the bone-conducting sound generator 2 and adjacent to the outer peripheral surface 2a of the bone-conducting sound generator 2. When the magnetic leakage of the air-conducting sound generator 3 is large, it has a large attractive force on surrounding ferromagnetic objects, which can adversely affect the internal electronic components when installed in the sound-generating unit 10. The magnitude of magnetic leakage can be adjusted by controlling the thickness of the air-conducting support 30, main magnet 311, main pole core plate 313, auxiliary magnet 312, auxiliary pole core plate 314 and / or magnetically conductive support 310, etc. The magnitude of magnetic leakage can also be adjusted by controlling the number and position of auxiliary magnet 312, auxiliary pole core plate 314 and / or magnetically conductive side plate 3101. Similarly, variations in thickness, quantity, and position will affect the sound output of the air-conducting sound-generating device 3. Further, optionally, the maximum magnetic leakage range at the outer peripheral surface 3a of the air-conducting sound-generating device 3 is 20-80 mT, and the maximum magnetic leakage range at the bottom surface 3b of the air-conducting sound-generating device 3 is 30-100 mT, so that the components of the air-conducting sound-generating device 3 are within a suitable size range, and the quantity and position of the auxiliary magnet 312, the auxiliary pole core plate 314, and the magnetically conductive side plate 3101 are more reasonable. This reduces magnetic leakage while ensuring the sound output of the air-conducting sound-generating device 3, and also helps to keep its mass and volume within a suitable range.

[0173] In some embodiments, the maximum magnetic leakage at the top surface 3d of the air-conducting sound-generating device 3 is less than the maximum magnetic leakage at the outer peripheral surface 2a of the bone-conducting sound-generating device 2, for reference. Figure 8b When the top surface 3d of the air-conducting sound-generating device 3 is installed facing the bone-conducting sound-generating device 2, its diaphragm assembly 32 is positioned opposite to the bone-conducting support 20. The diaphragm assembly 32 is closer to the bone-conducting sound-generating device 2 than the magnetic base plate 3100. At this time, the maximum leakage magnetic field at the top surface 3d of the air-conducting sound-generating device 3 is set to be smaller than the maximum leakage magnetic field at the outer peripheral surface 2a of the bone-conducting sound-generating device 2, which can reduce the interference of its leakage magnetic field on the bone-conducting sound-generating device 2. The top surface 3d of the air-conducting sound-generating device 3 refers to the outer surface of the component inside the folded ring portion 3212 of the diaphragm 321. For example, when the air-conducting sound-generating device 3 does not include the reinforcing plate 3213, the outer surface of the middle plate 3211 of the diaphragm 321 is the top surface 3d. When the air-conducting sound-generating device 3 includes the reinforcing plate 3213, the outer surface of the reinforcing plate 3213 is the top surface 3d.

[0174] Optionally, the maximum magnetic leakage range at the outer peripheral surface 3a of the air-conducting sound-generating device 3 is 10mT to 120mT, and the maximum magnetic leakage range at the top surface 3d of the air-conducting sound-generating device 3 is 20 to 150mT. The magnetic leakage at the top surface 3d can be adjusted by controlling the thickness of the main magnet 311, the main pole core plate 313, the auxiliary magnet 312 and / or the auxiliary pole core plate 314, or by adjusting the distance between the main pole core plate 313, the auxiliary pole core plate 314 and / or the magnetically conductive side plate 3101 and the diaphragm 321. Generally, the greater the distance, the smaller the magnetic leakage. Further optionally, the maximum magnetic leakage range at the outer peripheral surface 3a of the air-conducting sound generator 3 is 20-80 mT, and the maximum magnetic leakage range at the bottom surface 3b of the air-conducting sound generator 3 is 30-100 mT, so that each component has a suitable size, and the distance between the main pole core plate 313, the secondary pole core plate 314 and the magnetically conductive side plate 3101 and the diaphragm 321 is more suitable, so that the size of the air-conducting sound generator 3 is more suitable, and the sound generation effect of the air-conducting sound generator 3 is guaranteed while reducing magnetic leakage.

[0175] In some embodiments, the maximum magnetic leakage at the top surface 3d and bottom surface 3b of the air-conducting sound generator 3 is less than the maximum magnetic leakage at the outer peripheral surface 2a of the bone-conducting sound generator 2, so that the magnetic leakage interference between the two sound generators is relatively small regardless of whether the air-conducting sound generator 3 is installed facing or away from the bone-conducting sound generator 2. Optionally, the maximum magnetic leakage at the outer peripheral surface 3a of the air-conducting sound generator 3 is in the range of 10mT to 120mT, and the maximum magnetic leakage at the top surface 3d and bottom surface 3b of the air-conducting sound generator 3 is in the range of 20 to 150mT. More optionally, the maximum magnetic leakage at the outer peripheral surface 3a of the air-conducting sound generator 3 is in the range of 20 to 80mT, and the maximum magnetic leakage at the top surface 3d and bottom surface 3b of the air-conducting sound generator 3 is in the range of 30mT to 100mT.

[0176] The magnitude of magnetic leakage flux can be measured using a teslameter (or gaussmeter). Specifically, the probe is moved along the outer peripheral surface 3a of the air conduction support 30 while remaining in close contact with the surface, circling the outer peripheral surface 3a once. The maximum value is taken as the maximum magnetic leakage flux value at the outer peripheral surface 3a. When the outer peripheral surface has a stepped structure (e.g., Figure 32 As shown, measurements are taken on the outermost surface of the air conduction support 30. Similarly, with the probe in close contact with the bottom surface 3b, the maximum value is taken as the maximum magnetic leakage value at the bottom surface 3b. With the probe in close contact with the top surface 3d, the maximum value is taken as the maximum magnetic leakage value at the top surface 3d.

[0177] In some embodiments, the bone conduction sound generator 2 and the air conduction sound generator 3 are not in contact and are spaced apart. Optionally, the distance L8 between the bone conduction sound generator 2 and the air conduction sound generator 3 is greater than or equal to 0.3 mm, which can reduce the mutual interference of vibrations between the bone conduction sound generator 2 and the air conduction sound generator 3, and at the same time reduce the mutual influence of leakage magnetic fields between them. Figure 8a In the illustrated embodiment, distance L8 is the distance between the magnetic base plate 3100 and the bone guide scaffold 20. Figure 8b In the illustrated embodiment, distance L8 is the distance between the folded loop portion 3212 and the bone conduction support 20. It can be understood that when the folded loop portion 3212 is concave, distance L8 is the distance between the top surface 3d and the bone conduction support 20. Further, distance L8 can be 0.3–6 mm to improve the space utilization of the sound unit, enabling a more compact design. A larger distance L8 increases the rear cavity of the air conduction, but this obviously leads to a simultaneous increase in the volume and weight of the sound unit 10, thus increasing the overall weight of the headphones, increasing the wearing burden, and affecting the user experience. Simultaneously, the increased weight leads to a simultaneous increase in vibration mass, resulting in a decrease in high-frequency sensitivity, making the sound less full and delicate, affecting the final listening quality. Further optionally, distance L8 can be 0.5–2 mm to further reduce volume and weight, improving the listening effect. Optionally, Figure 8a In the illustrated embodiment, the surface of the air-conducting sound-generating device 3 facing the bone-conducting sound-generating device 2 (i.e., the bottom surface 3b) is parallel to the surface of the bone-conducting sound-generating device 2 facing the air-conducting sound-generating device 3. Figure 8b In the illustrated embodiment, the surface of the air-conducting sound-generating device 3 facing the bone-conducting sound-generating device 2 (i.e., the top surface 3d) is parallel to the surface of the bone-conducting sound-generating device 2 facing the air-conducting sound-generating device 3, so as to make full use of space.

[0178] The magnetic base plate 3100 and / or magnetic side plate 3101 of the magnetic support member 310 are provided with at least one opening to allow the interior of the air-conducting sound-generating device 3 to communicate with the interior of the housing assembly 100, enabling smooth airflow. Optionally, the total area of ​​all the vent holes 3c of the magnetic support member 310 is 2 to 15 mm². 2 This is to ensure airflow while minimizing the adverse effects of the vent 3c on magnetic leakage prevention. Alternatively, the total area of ​​all openings can be 4–12 mm². 2 To further ensure the effectiveness.

[0179] The connection between the bone conduction sound generator 2 and the air conduction sound generator 3 and the control circuit board will be illustrated with examples below.

[0180] The leads of the coils of the bone conduction sound generator 2 and the air conduction sound generator 3 need to be electrically connected to the control circuit board 1124 inside the control compartment 112 so that they can operate under the control of the control circuit board 1124. The control circuit board 1124 of the control compartment 112 is connected to a cable 1125, which enters the sound generator 10 through the ear hook 111 so that it can be electrically connected to the bone conduction sound generator 2 and the air conduction sound generator 3.

[0181] In some embodiments, the cable 1125 is connected to the coil leads of the external circuit board 25 and the air-conducting sound-generating device 3.

[0182] In some embodiments, the sound-generating unit 10 further includes a transition circuit board 13, through which the bone conduction sound-generating device 2 is electrically connected to the control circuit board 1124. Optionally, such as Figure 43 As shown, cable 1125 is first connected to adapter circuit board 13, and then adapter circuit board 13 and external circuit board 25 are connected by wire 1126 to realize the electrical connection between bone conduction sound device 2 and control circuit board 1124. The coil lead 3200 of air conduction sound device 3 is directly connected to adapter circuit board 13 (including the case where lead 3200 and adapter circuit board 13 are connected by other wires) to realize the electrical connection between air conduction sound device 3 and adapter circuit board 13.

[0183] In other embodiments, the bone conduction sound-generating device 2 is directly connected to the control circuit board 1124 via a cable 1125, optionally, such as Figure 44 As shown, Figure 43 and Figure 44 The difference in the illustrated embodiment is that cable 1125 is partially connected to adapter circuit board 13 and partially directly connected to external circuit board 25 to realize electrical connection between control circuit board 1124 and bone conduction sound device 2.

[0184] The position of the adapter circuit board 13 can be varied. Figure 6 and Figure 45a , Figure 45b In the illustrated embodiment, the adapter circuit board 13 is attached to the inner wall of the housing 1000 and is positioned opposite the external circuit board 25, thereby facilitating wiring. In this case, the adapter circuit board 13, the external circuit board 25, and the air-conducting sound-generating device 3 are all arranged adjacent to each other, making wiring even more convenient. Figure 46a and Figure 46b In the embodiment shown, the adapter circuit board 13 is disposed at the bottom of the housing 1000 and connected to the inner bottom wall of the housing 1000 (for example, it can be directly attached to the inner bottom wall of the housing 1000 or connected to the positioning support column 120 on the inner bottom wall), and is located below the bone conduction sound generating device 2. At this time, it is convenient to open a wiring hole at the position corresponding to the external circuit board 25 in the housing 1000 so that the cable can pass into the housing 1000.

[0185] It should be noted that, in the absence of conflict, the various embodiments described herein can be combined with each other to obtain more implementation schemes.

[0186] The above are merely specific embodiments of the present invention, and any improvements made based on the concept of the present invention shall be considered within the scope of protection of the present invention.

Claims

1. A sound-generating unit, characterized in that, include: The housing assembly (100) includes a housing (1000) with one end open and a faceplate (1001) connected to the open end of the housing (1000), and the housing assembly (100) is provided with a sound outlet (1003). A bone conduction sound-emitting device (2) is disposed within the housing assembly (100) and connected to the faceplate (1001); and, An air-conducting sound-generating device (3) is disposed inside the outer shell assembly (100) and connected to the shell (1000). The bottom surface (3b) or top surface (3d) of the air-conducting sound-generating device (3) faces the outer peripheral surface of the bone-conducting sound-generating device (2). The air-conducting sound-generating device (3) emits sound outward through the sound outlet (1003). The maximum leakage magnetic field at the outer peripheral surface of the bone conduction sound generating device (2) is less than the leakage magnetic field at the end face (2b) of the bone conduction sound generating device (2) in the vibration direction A.

2. The sound-generating unit as described in claim 1, characterized in that, The maximum leakage magnetic field at the surface of the air-conducting sound-generating device (3) facing the bone-conducting sound-generating device (2) is less than the maximum leakage magnetic field at the outer peripheral surface of the bone-conducting sound-generating device (2). The surface of the air-conducting sound-generating device (3) facing the bone-conducting sound-generating device (2) is the bottom surface (3b) or the top surface (3d) of the air-conducting sound-generating device (3).

3. The sound-generating unit as described in claim 1, characterized in that, At the outer peripheral surface of the bone conduction sound generating device (2), the maximum magnetic leakage range is 10mT to 200mT. At the end face (2b) of the bone conduction sound generating device (2) in the vibration direction A, the maximum magnetic leakage range is 20mT to 300mT.

4. The sound-generating unit as described in claim 3, characterized in that, At the outer peripheral surface of the bone conduction sound generating device (2), the maximum magnetic leakage range is 30mT to 150mT, and at the end face (2b) of the bone conduction sound generating device (2) in the vibration direction A, the maximum magnetic leakage range is 40mT to 250mT.

5. The sound-generating unit as described in claim 1, characterized in that, At the outer peripheral surface of the air-conducting sound-generating device (3), the maximum magnetic leakage range is 10mT to 120mT, and at the surface of the air-conducting sound-generating device (3) facing the bone-conducting sound-generating device (2), the maximum magnetic leakage range is 20 to 150mT.

6. The sound-generating unit as described in claim 5, characterized in that, At the outer peripheral surface of the air-conducting sound-generating device (3), the maximum magnetic leakage range is 20 to 80 mT, and at the surface of the air-conducting sound-generating device (3) facing the bone-conducting sound-generating device (2), the maximum magnetic leakage range is 30 to 100 mT.

7. The sound-generating unit as described in claim 1, characterized in that, The distance L8 between the bone conduction sound generator (2) and the air conduction sound generator (3) is 0.3 to 6 mm.

8. The sound-generating unit as described in claim 1, characterized in that, The bone conduction sound-generating device (2) includes: Circular bone guide scaffold (20); A bone conduction magnetic circuit assembly (21) is disposed within the bone conduction support (20) and includes at least one magnet (210) and at least two magnetic plates (211). The magnet (210) is connected between two adjacent magnetic plates (211). The magnetic poles of the magnet (210) are arranged along the vibration direction A of the bone conduction sound generating device (2). When the number of magnets (210) is greater than two, the two magnets (210) are arranged opposite each other with the same pole. At least one bone conduction coil (22) is disposed within the bone conduction support (20) and fixed relative to the bone conduction support (20); at least one of the magnetic plates (211) is surrounded by one of the bone conduction coils (22); and, At least one spring clip (23) is connected between the bone magnetic circuit assembly (21) and the bone guide frame (20).

9. The sound-generating unit as described in claim 8, characterized in that, The wall thickness of the bone guide scaffold (20) is 0.3 to 0.5 mm.

10. The sound-generating unit as described in claim 8, characterized in that, The bone guide support (20) has an outlet hole (201) through which the lead wire of the bone guide coil (22) passes.

11. The sound-generating unit as described in claim 10, characterized in that, The area of ​​all the outlet holes (201) accounts for 1% to 2% of the area of ​​the outer peripheral surface of the entire bone guide frame (20), and the outer peripheral surface of the bone guide frame (20) is the outer peripheral surface of the bone guide sound generating device (2).

12. The sound-generating unit as described in claim 8, characterized in that, Along the vibration direction A of the bone conduction sound generating device (2), both ends of the bone conduction support (20) extend beyond the outermost magnetic plate (211) of the bone conduction magnetic circuit assembly (21), and the distance D15 of the extension is 0.4 to 1.5 mm.

13. The sound-generating unit as described in claim 8, characterized in that, The thickness B7 of a single magnet (210) is 1.8 mm to 3.2 mm.

14. The sound-generating unit as described in claim 13, characterized in that, The thickness B7 of a single magnet (210) is 2.2 mm to 2.8 mm.

15. The sound-generating unit as described in claim 8, characterized in that, The thickness B8 of a single magnetic conductive plate (211) is 0.3 to 0.8 mm.

16. The sound-generating unit as described in claim 15, characterized in that, The thickness B8 of a single magnetic conductive plate (211) is 0.5 to 0.65 mm.

17. The sound-generating unit as described in claim 8, characterized in that, The ratio of the thickness of a single magnet (210) to the thickness of a single magnetic plate (211) is 3 to 6.

18. The sound-generating unit as described in claim 15, characterized in that, The ratio of the thickness of a single magnet (210) to the thickness of a single magnetic plate (211) is 3.5 to 4.

5.

19. The sound-generating unit as described in claim 8, characterized in that, The bone conduction sound-generating device (2) includes a magnet (210) and two magnetic plates (211), wherein the magnet (210) is connected between two adjacent magnetic plates (211).

20. The sound-generating unit as described in claim 8, characterized in that, The bone guide scaffold (20) is made of magnetically conductive material.

21. The sound-generating unit according to any one of claims 1 to 20, characterized in that, The air-conducting sound-generating device (3) includes: Air-guided stent (30); A pneumatic magnetic circuit assembly (31), disposed within the pneumatic support (30), includes a magnetic base plate (3100), a main magnet (311) connected to the magnetic base plate (3100), and a main pole core plate (313) connected to the main magnet (311). The magnetic poles of the main magnet (311) are arranged along the vibration direction B of the pneumatic sound-generating device (3); and, The diaphragm assembly (32) includes a diaphragm (321) connected to the air conductor support (30) and an air conductor coil (320) connected to the diaphragm (321), the air conductor coil (320) surrounding the outside of the main pole plate (313).

22. The sound-generating unit as described in claim 21, characterized in that, The thickness B4 of the main magnet (311) is 0.7 to 1.4 mm, and the thickness B10 of the main pole core plate (313) is 0.2 mm to 0.4 mm.

23. The sound-generating unit as described in claim 22, characterized in that, The thickness B4 of the main magnet (311) is 0.9 to 1.2 mm.

24. The sound-generating unit as described in claim 22, characterized in that, The thickness ratio of the main magnet (311) to the main pole core plate (313) is 3.5 to 5.

5.

25. The sound-generating unit as described in claim 21, characterized in that, The thickness of the magnetic base plate (3100) is 0.3 to 0.6 mm.

26. The sound-generating unit as described in claim 21, characterized in that, The diaphragm (321) includes an outer ring plate (3210) connected to the air conduction bracket (30), an intermediate plate (3211) located inside the outer ring plate (3210), and a folded ring portion (3212) located between the outer ring plate (3210) and the intermediate plate (3211). The distance L6 from the intermediate plate (3211) to the main pole core plate (313) is 0.4 to 0.8 mm, and the distance L7 from the air conduction coil (320) to the magnetic base plate (3100) is 0.4 to 0.8 mm. Both the distance L6 and the distance L7 are greater than the maximum amplitude of the diaphragm (321) when the air conduction sound generating device (3) is working.

27. The sound-generating unit as described in claim 21, characterized in that, The air-conducting magnetic circuit assembly (31) further includes a magnetically conductive side plate (3101) protruding from the side edge of the magnetically conductive base plate (3100) toward the diaphragm assembly (32), the magnetically conductive side plate (3101) extending to be disposed opposite to the main pole core plate (313), and the air-conducting coil (320) is at least partially located between the main pole core plate (313) and the magnetically conductive side plate (3101); The air-conducting magnetic circuit assembly (31) includes a plurality of magnetically conductive side plates (3101), which are independent of each other or connected in a ring.

28. The sound-generating unit as described in claim 27, characterized in that, The face cover (1001) includes a contact surface (10010) for contacting human skin, the positive direction of the vibration direction A of the bone conduction sound generating device (2) points to the contact surface (10010), and the bone conduction sound generating device (2) includes an annular bone conduction support (20). The housing (1000) includes a side shell portion (1004), the positive direction of the vibration direction B of the air conduction sound generating device (3) points to the side shell portion (1004), the air conduction sound generating device (3) includes a magnetically conductive base plate (3100) disposed opposite to the bone conduction support (20), and the magnetically conductive base plate (3100) is provided with the bottom surface (3b).

29. The sound-generating unit as described in claim 28, characterized in that, The inner wall of the side shell (1004) is provided with a mounting groove (10041), the air-conducting sound generating device (3) is located in the mounting groove (10041), and at least part of the magnetically conductive side plate (3101) is located in the mounting groove (10041).

30. A head-mounted sound-generating device, characterized in that, Includes the sound-generating unit as described in any one of claims 1 to 29.

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